Observation of two collapsed phases in CaRbFe4As4

Stillwell, R. L.; Weir, S. T.; Jeffries, J R; Wang, X.; Wang, L.; Campbell, D. J.; Paglione, J. P.; Vohra, Y K

doi:10.1103/PhysRevB.100.045152

Title: Observation of two collapsed phases in $CaRbF e_{4} A s_{4}$

Abstract

We report the observation of the pressure-induced, fully collapsed tetragonal phase of $$CaRbF_{e_4}As_4$$ for $P ~ 22 GPa$ via high-pressure x-ray diffraction and magnetotransport measurements. The x-ray measurements, along with resistivity measurements, show that there is an initial half-collapsed tetragonal phase for $6 < P < 22$ GPa , in which superconductivity is continuously suppressed from $$T_ c = 35 K$$ at $P = 3.1 GP$a to $$T_c < 2 K$$ for $P ≥ 17.2 GPa$ , as well as signs of the fully collapsed tetragonal phase near $P = 22 GPa$. Density functional calculations suggest that both of these transitions are driven by increased As-As bonding, first across the Ca layer, and then at the second transition, across the Rb layer. Although electrical resistivity measurements in the fully collapsed tetragonal phase do not show superconductivity, there is a change in the slope of both the Hall coefficient and the longitudinal resistance near 22 GPa, suggesting a strong correlation between the electronic and lattice degrees of freedom in this new iron-based superconductor.

Authors:

Stillwell, R. L. ^[1]; Weir, S. T. ^[1]; Jeffries, J R ^[1]; Wang, X. ^[2]; Wang, L. ^[2]; Campbell, D. J. ^[2]; Paglione, J. P. ^[3]; Vohra, Y K ^[4]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Maryland, College Park, MD (United States). Dept. of Physics, Center for Nanophysics and Advanced Materials
Univ. of Maryland, College Park, MD (United States). Dept. of Physics, Center for Nanophysics and Advanced Materials; Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics

Publication Date:: 2019-07-31

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1568003

Alternate Identifier(s):: OSTI ID: 1545946

Report Number(s):: LLNL-JRNL-766982
Journal ID: ISSN 2469-9950; PRBMDO; 956760; TRN: US2100083

Grant/Contract Number:: AC52-07NA27344; AC52- 07NA27344; AC02-06CH11357; NA0003916; DE‐SC0014664

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 100; Journal Issue: 4; 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


                    Stillwell, R. L., Weir, S. T., Jeffries, J R, Wang, X., Wang, L., Campbell, D. J., Paglione, J. P., and Vohra, Y K. Observation of two collapsed phases in CaRbFe4As4.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevB.100.045152.

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                    Stillwell, R. L., Weir, S. T., Jeffries, J R, Wang, X., Wang, L., Campbell, D. J., Paglione, J. P., & Vohra, Y K. Observation of two collapsed phases in CaRbFe4As4.  United States.  https://doi.org/10.1103/PhysRevB.100.045152

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                    Stillwell, R. L., Weir, S. T., Jeffries, J R, Wang, X., Wang, L., Campbell, D. J., Paglione, J. P., and Vohra, Y K. Wed .  
"Observation of two collapsed phases in CaRbFe4As4".  United States.  https://doi.org/10.1103/PhysRevB.100.045152.  https://www.osti.gov/servlets/purl/1568003.

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@article{osti_1568003,

  title        = {Observation of two collapsed phases in CaRbFe4As4},

  author       = {Stillwell, R. L. and Weir, S. T. and Jeffries, J R and Wang, X. and Wang, L. and Campbell, D. J. and Paglione, J. P. and Vohra, Y K},

  abstractNote = {We report the observation of the pressure-induced, fully collapsed tetragonal phase of $CaRbF_{e_4}As_4$ for $P ~ 22 GPa$ via high-pressure x-ray diffraction and magnetotransport measurements. The x-ray measurements, along with resistivity measurements, show that there is an initial half-collapsed tetragonal phase for $6 < P < 22$ GPa , in which superconductivity is continuously suppressed from $T_ c = 35 K$ at $P = 3.1 GP$a to $T_c < 2 K$ for $P ≥ 17.2 GPa$ , as well as signs of the fully collapsed tetragonal phase near $P = 22 GPa$. Density functional calculations suggest that both of these transitions are driven by increased As-As bonding, first across the Ca layer, and then at the second transition, across the Rb layer. Although electrical resistivity measurements in the fully collapsed tetragonal phase do not show superconductivity, there is a change in the slope of both the Hall coefficient and the longitudinal resistance near 22 GPa, suggesting a strong correlation between the electronic and lattice degrees of freedom in this new iron-based superconductor.},

  doi          = {10.1103/PhysRevB.100.045152},

  journal      = {Physical Review B},

  number       = 4,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {7}

}

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Figure 1: Pressure dependence of lattice parameters from x-ray diffraction measurements and theoretical calculations. (a) Experimental and theoretical data showing the a-axis lattice expansion near 6 GPa at the half collapse, and the full collapse near 22 GPa. (b) The c-axis lattice parameter shows a much smaller effect, but stillmore »

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Comparison of the high-pressure behavior of the cerium oxides $C e_{2} O_{3}$ and $Ce O_{2}$

Journal Article Lipp, M. J. ; Jeffries, J. R. ; Cynn, H. ; ... - Physical Review B

The high pressure behavior of Ce2O3 was studied using angle dispersive X-ray diffraction to 70 GPa and compared with that of CeO2. Up to the highest pressure Ce2O3 remains in the hexagonal phase (space group 164, P-32/m1) typical for the lanthanide sesquioxides. A theoretically predicted phase instability for 30 GPa is not observed. The isothermal bulk modulus and its pressure derivative for the quasi-hydrostatic case are B0 = 111 ± 2 GPa, B0’ = 4.7 ± 0.3 and for the case without pressure transmitting medium B0 = 104 ± 4 GPa, B0’ = 6.5 ± 0.4. Starting from ambient pressuremore »« less
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https://doi.org/10.1103/PhysRevB.93.064106

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journal, July 1996

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journal, July 2008

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journal, December 2008

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journal, April 2001

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journal, April 2018

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journal, August 2006

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journal, October 1996

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journal, September 2008

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journal, February 2015

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journal, October 2010

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journal, August 2010

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journal, October 2011

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journal, June 2015

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journal, January 2010

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journal, November 2006

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journal, June 2012

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journal, August 2010

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journal, May 2015

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journal, September 2008

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journal, May 2008

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journal, April 2012

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journal, December 2016

Two-dimensional detector software: From real detector to idealised image or two-theta scan
journal, January 1996

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journal, November 2006

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journal, May 2021

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journal, February 2021

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journal, February 2020

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text, January 2009

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