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

Abstract

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-Tc materials with Tc’s near room temperature values. These findings confirm earlier expectations that hydrides may have very high Tc’s due to the fact that light H atoms have very high vibrational frequencies, leading to high Tc 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-Tc 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 LaH10-x and YH6-x superhydrides.

Authors:
 [1];  [2];  [2]; ORCiD logo [2];  [3]; ORCiD logo [3];  [4]; ORCiD logo [5];  [2]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab.
  2. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  3. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources
  4. Russian Academy of Sciences (RAS), Moscow (Russian Federation). Federal Scientific Research Center Crystallography and Photonics
  5. Russian Academy of Sciences (RAS), Moscow (Russian Federation). Federal Scientific Research Center Crystallography and Photonics, and Inst. for Nuclear Research
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
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
OSTI Identifier:
1608047
Alternate Identifier(s):
OSTI ID: 1604112
Grant/Contract Number:  
FG02-94ER14466; EAR-1634415; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Matter and Radiation at Extremes
Additional Journal Information:
Journal Volume: 5; Journal Issue: 2; Journal ID: ISSN 2468-2047
Publisher:
China Academy of Engineering Physics (CAEP)/AIP Publishing
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Struzhkin, Viktor, Li, Bing, Ji, Cheng, Chen, Xiao-Jia, Prakapenka, Vitali, Greenberg, Eran, Troyan, Ivan, Gavriliuk, Alexander, and Mao, Ho-kwang. Superconductivity in La and Y hydrides: Remaining questions to experiment and theory. United States: N. p., 2020. Web. doi:10.1063/1.5128736.
Struzhkin, Viktor, Li, Bing, Ji, Cheng, Chen, Xiao-Jia, Prakapenka, Vitali, Greenberg, Eran, Troyan, Ivan, Gavriliuk, Alexander, & Mao, Ho-kwang. Superconductivity in La and Y hydrides: Remaining questions to experiment and theory. United States. doi:https://doi.org/10.1063/1.5128736
Struzhkin, Viktor, Li, Bing, Ji, Cheng, Chen, Xiao-Jia, Prakapenka, Vitali, Greenberg, Eran, Troyan, Ivan, Gavriliuk, Alexander, and Mao, Ho-kwang. Wed . "Superconductivity in La and Y hydrides: Remaining questions to experiment and theory". United States. doi:https://doi.org/10.1063/1.5128736. https://www.osti.gov/servlets/purl/1608047.
@article{osti_1608047,
title = {Superconductivity in La and Y hydrides: Remaining questions to experiment and theory},
author = {Struzhkin, Viktor and Li, Bing and Ji, Cheng and Chen, Xiao-Jia and Prakapenka, Vitali and Greenberg, Eran and Troyan, Ivan and Gavriliuk, Alexander and Mao, Ho-kwang},
abstractNote = {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-Tc materials with Tc’s near room temperature values. These findings confirm earlier expectations that hydrides may have very high Tc’s due to the fact that light H atoms have very high vibrational frequencies, leading to high Tc 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-Tc 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 LaH10-x and YH6-x superhydrides.},
doi = {10.1063/1.5128736},
journal = {Matter and Radiation at Extremes},
number = 2,
volume = 5,
place = {United States},
year = {2020},
month = {3}
}

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