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Title: Superconducting High-Pressure Phases Composed of Hydrogen and Iodine

Abstract

Evolutionary structure searches predict three new phases of iodine polyhydrides stable under pressure. Insulating P1-H5I, consisting of zigzag chains of (HI) δ+ and H 2 molecules, is stable between 30-90 GPa. Cmcm-H2I and P6/mmm-H4I are found on the 100, 150 and 200 GPa convex hulls. These two phases are good metals, even at 1 atm, because they consist of monoatomic lattices of iodine. At 100 GPa the superconducting transition temperature, Tc, of H2I and H4I are estimated to be 7.8 and 17.5 K, respectively. Lastly, the increase in Tc relative to elemental iodine results from a larger ωlog from the light mass of hydrogen, and an enhanced from modes containing H/I and H/H vibrations.

Authors:
 [1];  [1]
  1. Department of Chemistry, State University of New York at Buffalo, 331 Natural Sciences Complex, Buffalo, New York 14260-3000, United States
Publication Date:
Research Org.:
Carnegie Inst. of Science, Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1411499
Alternate Identifier(s):
OSTI ID: 1335643; OSTI ID: 1335650
Grant/Contract Number:  
NA0002006
Resource Type:
Published Article
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Name: Journal of Physical Chemistry Letters Journal Volume: 6 Journal Issue: 20; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; first-principles; novel materials; structure prediction; superconductivity; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Shamp, Andrew, and Zurek, Eva. Superconducting High-Pressure Phases Composed of Hydrogen and Iodine. United States: N. p., 2015. Web. doi:10.1021/acs.jpclett.5b01839.
Shamp, Andrew, & Zurek, Eva. Superconducting High-Pressure Phases Composed of Hydrogen and Iodine. United States. https://doi.org/10.1021/acs.jpclett.5b01839
Shamp, Andrew, and Zurek, Eva. Tue . "Superconducting High-Pressure Phases Composed of Hydrogen and Iodine". United States. https://doi.org/10.1021/acs.jpclett.5b01839.
@article{osti_1411499,
title = {Superconducting High-Pressure Phases Composed of Hydrogen and Iodine},
author = {Shamp, Andrew and Zurek, Eva},
abstractNote = {Evolutionary structure searches predict three new phases of iodine polyhydrides stable under pressure. Insulating P1-H5I, consisting of zigzag chains of (HI) δ+ and H 2 molecules, is stable between 30-90 GPa. Cmcm-H2I and P6/mmm-H4I are found on the 100, 150 and 200 GPa convex hulls. These two phases are good metals, even at 1 atm, because they consist of monoatomic lattices of iodine. At 100 GPa the superconducting transition temperature, Tc, of H2I and H4I are estimated to be 7.8 and 17.5 K, respectively. Lastly, the increase in Tc relative to elemental iodine results from a larger ωlog from the light mass of hydrogen, and an enhanced from modes containing H/I and H/H vibrations.},
doi = {10.1021/acs.jpclett.5b01839},
journal = {Journal of Physical Chemistry Letters},
number = 20,
volume = 6,
place = {United States},
year = {Tue Sep 29 00:00:00 EDT 2015},
month = {Tue Sep 29 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1021/acs.jpclett.5b01839

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Cited by: 35 works
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