Hot Hydride Superconductivity Above 550 K

Grockowiak, Audrey D.; Ahart, M.; Helm, T.; Coniglio, W. A.; Kumar, R.; Glazyrin, K.; Garbarino, G.; Meng, Y.; Oliff, M.; Williams, V.; Ashcroft, N. W.; Hemley, R. J.; Somayazulu, M.; Tozer, S. W.

doi:10.3389/femat.2022.837651

Title: Hot Hydride Superconductivity Above 550 K

Journal Article · Thu Mar 03 19:00:00 EST 2022 · Frontiers in Electronic Materials

DOI: https://doi.org/10.3389/femat.2022.837651 · OSTI ID:1856217

Grockowiak, Audrey D. ^[1]; Ahart, M. ^[2]; Helm, T. ^[3]; Coniglio, W. A. ^[4]; Kumar, R. ^[2]; Glazyrin, K. ^[5]; Garbarino, G. ^[6]; Meng, Y. ^[7]; Oliff, M. ^[4]; Williams, V. ^[4]; Ashcroft, N. W. ^[8]; Hemley, R. J. ^[2]; Somayazulu, M. ^[7]; Tozer, S. W. ^[4]

Florida State Univ., Tallahassee, FL (United States); Brazilian Synchrotron Light Lab. (LNLS/Sirius), Campinas (Brazil)
Univ. of Illinois, Chicago, IL (United States)
Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Florida State Univ., Tallahassee, FL (United States)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Argonne National Lab. (ANL), Lemont, IL (United States)
Cornell Univ., Ithaca, NY (United States)

The search for room temperature superconductivity has accelerated in the last few years driven by experimentally accessible theoretical predictions that indicated alloying dense hydrogen with other elements could produce conventional superconductivity at high temperatures and pressures. These predictions helped inform the synthesis of simple binary hydrides that culminated in the discovery of the superhydride LaH₁₀ with a superconducting transition temperature T_c of 260 K at 180 GPa. We have now successfully synthesized a metallic La-based superhydride with an initial T_c of 294 K. When subjected to subsequent thermal excursions that promoted a chemical reaction to a higher order system, the Tc onset was driven irreversibly to 556 K. X-ray characterization confirmed the formation of a distorted LaH₁₀ based backbone that suggests the formation of ternary or quaternary compounds with substitution at the La and/or H sites. The results provide evidence for hot superconductivity, aligning with recent predictions for higher order hydrides under pressure.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Illinois, Chicago, IL (United States)

Sponsoring Organization:: Chicago/DOE Alliance Center (CDAC); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Defense Programs (DP)

Grant/Contract Number:: AC02-06CH11357; NA0003975

OSTI ID:: 1856217

Journal Information:: Frontiers in Electronic Materials, Journal Name: Frontiers in Electronic Materials Vol. 2; ISSN 2673-9895

Publisher:: Frontiers Media S.A.Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
high pressure
higher order lanthanum superhydride
megabar
superconductivity
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Title: Hot Hydride Superconductivity Above 550 K

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