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Title: Superconductivity of barium-VI synthesized via compression at low temperatures

Abstract

For this research using a membrane-driven diamond anvil cell and both ac magnetic susceptibility and electrical resistivity measurements, we have characterized the superconducting phase diagram of elemental barium to pressures as high as 65 GPa. We have determined the superconducting properties of the recently discovered Ba-VI crystal structure, which can only be accessed via the application of pressure at low temperature. We find that Ba-VI exhibits a maximum Tc near 8 K, which is substantially higher than the maximum Tc found when pressure is applied at room temperature. We discuss our results in terms of the implications for pressure-induced superconductivity in other elements exhibiting complex/modulated structures at high pressure. Lastly, we highlight the potential of cryogenic compression to reveal additional richness in previously explored high-pressure phase diagrams.

Authors:
 [1];  [1];  [2];  [3];  [1]
+ Show Author Affiliations
  1. Univ. of Florida, Gainesville, FL (United States). Department of Physics
  2. Univ. of Birmingham (United Kingdom). Department of Physics
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1458667
Alternate Identifier(s):
OSTI ID: 1408929
Report Number(s):
LLNL-JRNL-736279
Journal ID: ISSN 2469-9950; PRBMDO; 887436; TRN: US1901497
Grant/Contract Number:  
AC52-07NA27344; NA0002928
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Jackson, D. E., VanGennep, D., Vohra, Y. K., Weir, S. T., and Hamlin, J. J. Superconductivity of barium-VI synthesized via compression at low temperatures. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.184514.
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Jackson, D. E., VanGennep, D., Vohra, Y. K., Weir, S. T., & Hamlin, J. J. Superconductivity of barium-VI synthesized via compression at low temperatures. United States. https://doi.org/10.1103/PhysRevB.96.184514
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Jackson, D. E., VanGennep, D., Vohra, Y. K., Weir, S. T., and Hamlin, J. J. Wed . "Superconductivity of barium-VI synthesized via compression at low temperatures". United States. https://doi.org/10.1103/PhysRevB.96.184514. https://www.osti.gov/servlets/purl/1458667.
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@article{osti_1458667,
title = {Superconductivity of barium-VI synthesized via compression at low temperatures},
author = {Jackson, D. E. and VanGennep, D. and Vohra, Y. K. and Weir, S. T. and Hamlin, J. J.},
abstractNote = {For this research using a membrane-driven diamond anvil cell and both ac magnetic susceptibility and electrical resistivity measurements, we have characterized the superconducting phase diagram of elemental barium to pressures as high as 65 GPa. We have determined the superconducting properties of the recently discovered Ba-VI crystal structure, which can only be accessed via the application of pressure at low temperature. We find that Ba-VI exhibits a maximum Tc near 8 K, which is substantially higher than the maximum Tc found when pressure is applied at room temperature. We discuss our results in terms of the implications for pressure-induced superconductivity in other elements exhibiting complex/modulated structures at high pressure. Lastly, we highlight the potential of cryogenic compression to reveal additional richness in previously explored high-pressure phase diagrams.},
doi = {10.1103/PhysRevB.96.184514},
journal = {Physical Review B},
number = 18,
volume = 96,
place = {United States},
year = {Wed Nov 15 00:00:00 EST 2017},
month = {Wed Nov 15 00:00:00 EST 2017}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.96.184514
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic structural phase diagram for Ba based on Ref. [8]. (b) Phase diagram indicating superconducting critical temperature versus pressure. The solid black line indicates Tc as determined by previous measurements in which pressure was varied at room temperature [17–19]. The Tc of Ba-VI (black circles) reaches substantiallymore » higher values than any of the other structures of Ba. Further details of each measurement run are summarized in Table I.« less
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Works referenced in this record:

Superconductivity in the metallic elements at high pressures
journal, July 2015

Superconducting properties of barium in three phases under high pressure from first principles
journal, August 2013

Pressure-induced reentrant metallic phase in lithium
journal, April 2014

Competition of Charge-Density Waves and Superconductivity in Sulfur
journal, October 2007

Brillouin Zone Concept And Crystal Structures Of sp Metals Under High Pressure
journal, September 2003

Anomalous superconductivity and pressure induced phase transitions in black phosphorus
journal, June 1985

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B.</span> </li> <li> Physical Review B, Vol. 41, Issue 13</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevB.41.8937" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevB.41.8937<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1080/00018739400101465" target="_blank" rel="noopener noreferrer" class="name">The solid-state properties of uranium A historical perspective and review<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1994-02-01">February 1994</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Lander, G. H.; Fisher, E. S.; Bader, S. D.</span> </li> <li> Advances in Physics, Vol. 43, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1080/00018739400101465" class="text-muted" target="_blank" rel="noopener noreferrer">10.1080/00018739400101465<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1063/1.367113" target="_blank" rel="noopener noreferrer" class="name">Demagnetizing factors for rectangular ferromagnetic prisms<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1998-03-15">March 1998</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Aharoni, Amikam</span> </li> <li> Journal of Applied Physics, Vol. 83, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1063/1.367113" class="text-muted" target="_blank" rel="noopener noreferrer">10.1063/1.367113<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="sr-only">Previous Page</span><span class="fa fa-angle-left"></span></a> <ul class="pagination d-inline-block" style="padding-left:.2em;"></ul> <a class="pure-button next page" href="#" rel="next"><span class="sr-only">Next Page</span><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-references" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All References</a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-references" data-filter="type" data-pattern="journal"><span class="fa fa-angle-right"></span> journal<small class="text-muted"> (41)</small></a></li> </ul> <div style="margin-top:2em;"> <form class="pure-form small text-muted reference-search"> <label for="reference-search-text" class="sr-only">Search</label> <input class="search form-control pure-input-1" id="reference-search-text" placeholder="Search" style="margin-bottom:10px;" /> <fieldset aria-label="Sort By"> <legend class="legend-filters sr-only">Sort by:</legend> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort" name="references-sort" data-sort="name" style="position:relative;top:2px;" id="reference-search-sort-name"><label for="reference-search-sort-name" style="margin-left: .3em;">Sort by title</label></div> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort" name="references-sort" data-sort="date" data-order="desc" style="position:relative;top:2px;" id="reference-search-sort-date"><label for="reference-search-sort-date" style="margin-left: .3em;">Sort by date</label></div> </fieldset> <div class="text-left" style="margin-left:1em;"> <a href="" class="filter-clear clearfix" title="Clear filter / sort" style="font-weight:normal; float:none;">[ × clear filter / sort ]</a> </div> <input type="submit" id="sort_submit_references" name="submit" aria-label="submit" style="display: none;"/> </form> </div> </div> </div> </section> <section id="biblio-images" class="tab-content tab-content-sec osti-curated" data-tab="biblio"> <div class="row"> <div class="col-sm-9 order-sm-9"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;"><span id="image-type-label">Figures / Tables</span> found in this record:</p> <div class="list clearfix"> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 4" data-order="1" data-imgid="1458667-img122689" data-imgsrc="/biblio/1458667/image/000/933/0009335/2/0122689.png" data-title="FIG. 1" data-desc="(a) Schematic structural phase diagram for Ba based on Ref. [8]. (b) Phase diagram indicating superconducting critical temperature versus pressure. The solid black line indicates Tc as determined by previous measurements in which pressure was varied at room temperature [17–19]. The Tc of Ba-VI (black circles) reaches substantially higher values than any of the other structures of Ba. Further details of each measurement run are summarized in Table I." data-ostiid="1458667" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1458667-img122689" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1458667-img122689"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 1 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 4)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1458667/image/000/933/0009335/2/t0122689.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 4" data-order="2" data-imgid="1458667-img122686" data-imgsrc="/biblio/1458667/image/000/933/0009335/2/0122686.png" data-title="TABLE I" data-desc="Summary of the different sets of measurements. The symbols in the leftmost column correspond to the symbols used in the phase diagram presented in Fig. 1. The column labeled “Type” indicates whether resistivity (ρ) or AC magnetic susceptibility (χ) was measured. “Measurement sequence” indicates the path that was taken through temperature-pressure phase space." data-ostiid="1458667" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1458667-img122686" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1458667-img122686"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">TABLE I <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 4)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1458667/image/000/933/0009335/2/t0122686.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 5" data-order="3" data-imgid="1458667-img122690" data-imgsrc="/biblio/1458667/image/000/933/0009335/2/0122690.png" data-title="FIG. 2" data-desc="Real (a) and imaginary (b) part of the magnetic susceptibility for Run A while unloading the pressure below 10 K. Each curve has been offset by a constant value for clarity. The size of the transitions are consistent with the estimated jump for a full shielding indicated by the scale bar at the bottom left of the figure." data-ostiid="1458667" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1458667-img122690" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1458667-img122690"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 2 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 5)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1458667/image/000/933/0009335/2/t0122690.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 6" data-order="4" data-imgid="1458667-img65635" data-imgsrc="/biblio/1458667/image/000/933/0009335/2/0065635.png" data-title="FIG. 3" data-desc="(a) Run C resistivity data taken while increasing the pressure at 10 K so as to enter the Ba-VI state. Superconductivity was observed beginning at 14 GPa with an incomplete transition above 2 K. The critical temperature peaked slightly above 8 K at 30 GPa. At 40 GPa the sample was annealed for 3 hours at 50 K, resulting in a slight drop in Tc and broadening of the transition. (b) Resistivity at 10 K versus pressure for Run C. The resistivity dropped by factor of ∼ 2 after annealing at 50 K. The changes in the magnitude of the resistivity and superconducting transition after annealing suggest that the sample has partially converted to Ba-V." data-ostiid="1458667" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1458667-img65635" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1458667-img65635"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 3 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 6)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1458667/image/000/933/0009335/2/t0065635.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="fa fa-angle-left"></span></a><ul class="pagination d-inline-block" style="padding-left:.2em;"></ul><a class="pure-button next page" href="#" rel="next"><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-images" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All Images</a></li> <li class="small" style="margin-left:.75em; 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padding:1em;"> <em>Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.</em> </div> </div> </div> </section> <section id="biblio-related" class="tab-content tab-content-sec " data-tab="biblio"> <div class="row"> <div class="col-sm-9 order-sm-9"> <section id="biblio-similar" class="tab-content tab-content-sec active" data-tab="related"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;">Similar Records in DOE PAGES and OSTI.GOV collections:</p> <aside> <ul class="item-list" itemscope itemtype="http://schema.org/ItemList" style="padding-left:0; list-style-type: none;"> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="0" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/22486151-high-pressurelow-temperature-phase-diagram-barium-simplicity-versus-complexity" itemprop="url">High pressure–low temperature phase diagram of barium: Simplicity versus complexity</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Desgreniers, Serge</span> ; <span class="author">Tse, John S., E-mail: John.Tse@usask.ca</span> ; <span class="author">State Key Laboratory of Superhard Materials, Jilin University, 130012 Changchun</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Applied Physics Letters</span> </span> </div> <div class="abstract">Barium holds a distinctive position among all elements studied upon densification. Indeed, it was the first example shown to violate the long-standing notion that high compression of simple metals should preserve or yield close-packed structures. From modest pressure conditions at room temperature, barium transforms at higher pressures from its simple structures to the extraordinarily complex atomic arrangements of the incommensurate and self-hosting Ba-IV phases. By a detailed mapping of the pressure/temperature structures of barium, we demonstrate the existence of another crystalline arrangement of barium, Ba-VI, at low temperature and high pressure. The simple structure of Ba-VI is unlike that of<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> complex Ba-IV, the phase encountered in a similar pressure range at room temperature. First-principles calculations predict Ba-VI to be stable at high pressure and superconductive. The results illustrate the complexity of the low temperature-high pressure phase diagram of barium and the significant effect of temperature on structural phase transformations.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1063/1.4936849" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="22486151" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1063/1.4936849</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="1" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1126988-pressure-induced-superconductivity-structural-transitions-ba-fe0" itemprop="url">Pressure-induced superconductivity and structural transitions in Ba(Fe<sub>0.9</sub>Ru<sub>0.1</sub>)<sub>2</sub>As<sub>2</sub></a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Uhoya, Walter O.</span> ; <span class="author">Tsoi, Georgiy M.</span> ; <span class="author">Vohra, Yogesh K.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - European Physical Journal. B, Condensed Matter and Complex Systems</span> </span> </div> <div class="abstract">Electrical transport and structural characterizations of isoelectronically substituted Ba(Fe<sub>0.9</sub>Ru<sub>0.1</sub>)<sub>2</sub>As<sub>2</sub> have been performed as a function of pressure up to ~30 GPa and temperature down to ~10 K using designer diamond anvil cell. Similar to undoped members of the AFe<sub>2</sub>As<sub>2</sub> (A = Ca, Sr, Ba) family, Ba(Fe<sub>0.9</sub>Ru<sub>0.1</sub>)<sub>2</sub>As<sub>2</sub> shows anomalous a-lattice parameter expansion with increasing pressure and a concurrent ThCr<sub>2</sub>Si<sub>2</sub> type isostructural (I4/mmm) phase transition from tetragonal (T) phase to a collapsed tetragonal (cT) phase occurring between 12 and 17 GPa where the a is maximum. Above 17 GPa, the material remains in the cT phase up to 30 GPa at 200<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> K. The resistance measurements show evidence of pressure-induced zero resistance that may be indicative of high-temperature superconductivity for pressures above 3.9 GPa. The onset of the resistive transition temperature decreases gradually with increasing pressure before completely disappearing for pressures above ~10.6 GPa near the T-cT transition. We have determined the crystal structure of the high-T <sub>c</sub> phase of Ru-doped BaFe<sub>2</sub>As<sub>2</sub> to remain as tetragonal (I4/mmm) by analyzing the X-ray diffraction pattern obtained at 10 K and 9.7 ± 0.7 GPa, as opposed to inferring the structural transition from electrical resistance measurement, as in a previous report [S.K. Kim, M.S. Torikachvili, E. Colombier, A. Thaler, S.L. Bud’ko, P.C. Canfield, Phys. Rev. B 84, 134525 (2011)].</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <span class="fa fa-book text-muted" aria-hidden="true"></span> Cited by 1<div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1140/epjb/e2014-40265-8" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1126988" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1140/epjb/e2014-40265-8</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1126988" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1126988" data-product-type="Journal Article" data-product-subtype="AM" >Full Text Available</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="2" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1335842-metallization-superconductivity-hydrogen-rich-ionic-salt-bareh9" itemprop="url">Metallization and superconductivity in the hydrogen-rich ionic salt BaReH<sub>9</sub></a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Muramatsu, Takaki</span> ; <span class="author">Wanene, Wilson K.</span> ; <span class="author">Somayazulu, Maddury</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Journal of Physical Chemistry. C</span> </span> </div> <div class="abstract">BaReH<sub>9</sub> is an exceedingly high hydrogen content metal hydride that is predicted to exhibit interesting behavior under pressure. The high-pressure electronic properties of this material were investigated using diamond-anvil cell electrical conductivity techniques to megabar (100 GPa) pressures. The measurements show that BeReH<sub>9</sub> transforms to a metal and then superconductor above 100 GPa with a maximum T<sub>c</sub> near 7 K. The occurrence of superconductivity is confirmed by the suppression of the resistance drop on application of magnetic fields. The transition to the metallic phase is sluggish, but is accelerated by laser irradiation. Raman scattering and x-ray diffraction measurements, used to<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> supplement the electrical measurements, indicate that the Ba-Re sublattice is largely preserved on compression at the conditions explored, but there is a possibility that hydrogen atoms are gradually disordered under pressure. This is suggested from sharpening of peaks of Raman spectroscopy and x-ray diffraction by heat treatment as well as temperature dependence of resistance under pressure. The data suggest that the transition to the superconducting state is first order. Furthermore, the possibility that the transition is associated with the breakdown of BeReH<sub>9</sub> is discussed.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <span class="fa fa-book text-muted" aria-hidden="true"></span> Cited by 48<div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1021/acs.jpcc.5b03709" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1335842" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1021/acs.jpcc.5b03709</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1335842" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1335842" data-product-type="Journal Article" data-product-subtype="AM" >Full Text Available</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="3" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/385710-pressure-dependence-superconducting-critical-temperature-tl-sub-ba-sub-ca-sub-cu-sub-sub-ital-tl-sub-ba-sub-ca-sub-cu-sub-sub-ital-up-gpa" itemprop="url">Pressure dependence of the superconducting critical temperature of Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{ital y}} and Tl{sub 2}Ba{sub 2}Ca{sub 3}Cu{sub 4}O{sub 12+{ital y}} up to 21 GPa</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Jover, D T</span> ; <span class="author">Wijngaarden, R J</span> ; <span class="author">Griessen, R</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review, B: Condensed Matter</span> </span> </div> <div class="abstract">Using a cryogenic diamond anvil cell (DAC) the pressure dependence of the superconducting transition temperature {ital T}{sub {ital c}} of Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{ital y}} (Tl-2223) and Tl{sub 2}Ba{sub 2}Ca{sub 3}Cu{sub 4}O{sub 12+{ital y}} (Tl-2234) has been measured resistively up to 21 GPa. At ambient pressure these compounds have {ital T}{sub {ital c}}{close_quote}s of 128.5 K and 113 K. At low pressures, the pressure dependence {partial_derivative}{ital T}{sub {ital c}}/{partial_derivative}{ital p} is 1.75 K/GPa in Tl-2223 and 2.0 K/GPa in Tl-2234. As pressure is increased {ital T}{sub {ital c}} continues to increase (although the rate diminishes) until {ital T}{sub<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> {ital c}} reaches a maximum of 133 K at 4.2 GPa in Tl-2223 and of 120 K at 6.6 GPa in Tl-2234. At higher pressures {ital T}{sub {ital c}} decreases. In this region a rather abrupt change in {partial_derivative}{ital T}{sub {ital c}}/{partial_derivative}{ital p} is observed at {ital p}{sub {ital c}}=12.0 GPa in Tl-2223 and at {ital p}{sub {ital c}}=10.5 GPa in Tl-2234. The kink at {ital p}{sub {ital c}} is interpreted as an indication of the presence of {ital inequivalent} CuO{sub 2} layers: Below {ital p}{sub {ital c}} the {ital T}{sub {ital c}} of the samples is determined by the intrinsic {ital T}{sub {ital c}} of the outer CuO{sub 2} layers while above {ital p}{sub {ital c}} it is determined by that of the inner CuO{sub 2} layers. {copyright} {ital 1996 The American Physical Society.}</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1103/PhysRevB.54.10175" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="385710" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1103/PhysRevB.54.10175</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="4" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/988252-anomalous-compressibility-effects-superconductivity-eufe2as2-under-high-pressures" itemprop="url">Anomalous compressibility effects and superconductivity of EuFe2As2 under high pressures</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Uhoya, Walter</span> ; <span class="author">Tsoi, Georgiy</span> ; <span class="author">Vohra, Y. K.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Journal of Physics: Condensed Matter</span> </span> </div> <div class="abstract">The crystal structure and electrical resistance of structurally layered EuFe{sub 2}As{sub 2} have been studied up to 70 GPa and down to a temperature of 10 K, using a synchrotron x-ray source and designer diamond anvils. The room temperature compression of the tetragonal phase of EuFe{sub 2}As{sub 2} (I4/mmm) results in an increase in the a-axis length and a rapid decrease in the c-axis length with increasing pressure. This anomalous compression reaches a maximum at 8 GPa and the tetragonal lattice behaves normally above 10 GPa, with a nearly constant c/a axial ratio. The rapid rise in the superconducting transition<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> temperature (T{sub c}) to 41 K with increasing pressure is correlated with this anomalous compression, and a decrease in T{sub c} is observed above 10 GPa. We present P-V data or the equation of state for EuFe{sub 2}As{sub 2} both in the ambient tetragonal phase and in the high pressure collapsed tetragonal phase up to 70 GPa.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1088/0953-8984/22/29/292202" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="988252" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1088/0953-8984/22/29/292202</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> </ul> </aside> </div> </section> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a class="tab-nav disabled" data-tab="related" style="color: #636c72 !important; opacity: 1;"><span class="fa fa-angle-right"></span> Similar Records</a></li> </ul> </div> </div> </section> </div></div> </div> </div> </section> <footer class="" style="background-color:#f9f9f9;"> <div class="footer-minor"> <div class="container"> <hr class="footer-separator"/> <br/> <div class="col text-center mt-3"> <div class="pure-menu pure-menu-horizontal"> <ul class="pure-menu-list" id="footer-org-menu"> <li class="pure-menu-item"> <a href="https://energy.gov" target="_blank" rel="noopener noreferrer"> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" class="sprite sprite-footer-us-doe-min" alt="U.S. Department of Energy" /> </a> </li> <li class="pure-menu-item"> <a href="https://www.energy.gov/science/office-science" target="_blank" rel="noopener noreferrer"> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" class="sprite sprite-footer-office-of-science-min" alt="Office of Science" /> </a> </li> <li class="pure-menu-item"> <a href="https://www.osti.gov" target="_blank" rel="noopener noreferrer"> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" class="sprite sprite-footer-osti-min" alt="Office of Scientific and Technical Information" /> </a> </li> </ul> </div> </div> <div class="col text-center small" style="margin-top: 0.5em;margin-bottom:2.0rem;"> <div class="row justify-content-center" style="color:white"> <div class="pure-menu pure-menu-horizontal" style='white-space:normal'> <ul class="pure-menu-list"> <li class="pure-menu-item"><a href="https://www.osti.gov/disclaim" class="pure-menu-link" target="_blank" ref="noopener noreferrer"><span class="fa fa-institution"></span> Website Policies <span class="d-none d-sm-inline d-print-none" style="color:#737373;">/ Important Links</span></a></li> <li class="pure-menu-item" style='float:none;'><a href="/pages/contact" class="pure-menu-link"><span class="fa fa-comments-o"></span>Contact Us</a></li> <li class="d-block d-md-none mb-1"></li> <li class="pure-menu-item" style='float:none;'><a target="_blank" title="Vulnerability Disclosure Program" class="pure-menu-link" href="https://doe.responsibledisclosure.com/hc/en-us" rel="noopener noreferrer">Vulnerability Disclosure Program</a></li> <li class="d-block d-lg-none mb-1"></li> <li class="pure-menu-item" style="float:none;"><a href="https://www.facebook.com/ostigov" target="_blank" class="pure-menu-link social ext fa fa-facebook" rel="noopener noreferrer"><span class="sr-only" style="background-color: #fff; color: #333;">Facebook</span></a></li> <li class="pure-menu-item" style="float:none;"><a href="https://twitter.com/OSTIgov" target="_blank" class="pure-menu-link social ext fa fa-twitter" rel="noopener noreferrer"><span class="sr-only" style="background-color: #fff; color: #333;">Twitter</span></a></li> <li class="pure-menu-item" style="float:none;"><a href="https://www.youtube.com/user/ostigov" target="_blank" class="pure-menu-link social ext fa fa-youtube-play" rel="noopener noreferrer"><span class="sr-only" style="background-color: #fff; color: #333;">Youtube</span></a></li> </ul> </div> </div> </div> </div> </div> </footer> <link href="/pages/css/pages.fonts.240327.0205.css" rel="stylesheet"> <script src="/pages/js/pages.240327.0205.js"></script><noscript></noscript> <script defer src="/pages/js/pages.biblio.240327.0205.js"></script><noscript></noscript> <script defer src="/pages/js/lity.js"></script><noscript></noscript> <script async type="text/javascript" src="/pages/js/Universal-Federated-Analytics-Min.js?agency=DOE" id="_fed_an_ua_tag"></script><noscript></noscript> </body> <!-- DOE PAGES v.240327.0205 --> </html>