Superconductivity in La and Y hydrides: Remaining questions to experiment and theory

Struzhkin, Viktor; Li, Bing; Ji, Cheng; Chen, Xiao-Jia; Prakapenka, Vitali; Greenberg, Eran; Troyan, Ivan; Gavriliuk, Alexander; Mao, Ho-kwang

doi:10.1063/1.5128736

Title: Superconductivity in La and Y hydrides: Remaining questions to experiment and theory

Journal Article · Wed Mar 11 00:00:00 EDT 2020 · Matter and Radiation at Extremes

DOI:https://doi.org/10.1063/1.5128736· OSTI ID:1608047

Struzhkin, Viktor ^[1]; Li, Bing ^[2]; Ji, Cheng ^[2];

^[2]; Prakapenka, Vitali ^[3];

^[3]; Troyan, Ivan ^[4];

^[5]; Mao, Ho-kwang ^[2]

Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab.
Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources
Russian Academy of Sciences (RAS), Moscow (Russian Federation). Federal Scientific Research Center Crystallography and Photonics
Russian Academy of Sciences (RAS), Moscow (Russian Federation). Federal Scientific Research Center Crystallography and Photonics, and Inst. for Nuclear Research

Recent reports of the superconductivity in hydrides of two different families (covalent lattice, as in SH₃ and clathrate-type H-cages containing La and Y atoms, as in LaH₁₀ and YH₆) have revealed new families of high-T_c materials with T_c’s near room temperature values. These findings confirm earlier expectations that hydrides may have very high T_c’s due to the fact that light H atoms have very high vibrational frequencies, leading to high T_c values within the conventional Bardeen–Cooper–Schrieffer phonon mechanism of superconductivity. However, as is pointed out by Ashcroft, it is important to have the metallic hydrogen “alloyed” with the elements added to it. This concept of a metallic alloy containing a high concentration of metal-like hydrogen atoms has been instrumental in finding new high-T_c superhydrides. These new superhydride “room-temperature” superconductors are stabilized only at very high pressures above 100 GPa, making the experimental search for their superconducting properties very difficult. We will review the current experimental and theoretical results for LaH_10-x and YH_6-x superhydrides.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); State Council of the People’s Republic of China; Ministry of Science and Higher Education of the Russian Federation; Russian Science Foundation

Grant/Contract Number:: FG02-94ER14466; EAR-1634415; AC02-06CH11357

OSTI ID:: 1608047

Alternate ID(s):: OSTI ID: 1604112

Journal Information:: Matter and Radiation at Extremes, Vol. 5, Issue 2; ISSN 2468-2047

Publisher:: China Academy of Engineering Physics (CAEP)/AIP PublishingCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited By (3)

Memory of pressure-induced superconductivity in a phase-change alloy Huang, Ge; cao, ziyu; Wei, Tian-Ran Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2021-03475	text	January 2021
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Nonstandard superconductivity or no superconductivity in hydrides under high pressure Hirsch, J. E.; Marsiglio, F. arXiv https://doi.org/10.48550/arxiv.2012.12796	text	January 2020

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