Superconducting phase diagram of H3S under high magnetic fields

Shirin Mozaffari, Dan Sun, Vasily S. Minkov, Alexander P. Drozdov, Dmitry Knyazev, Jonathan B. Betts, Mari Einaga, Katsuya Shimizu, Mikhail I. Eremets, Luis Balicas and Fedor F. Balakirev ()
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Shirin Mozaffari: Florida State University
Dan Sun: Los Alamos National Laboratory
Vasily S. Minkov: Max-Planck-Institut fuer Chemie
Alexander P. Drozdov: Max-Planck-Institut fuer Chemie
Dmitry Knyazev: Max-Planck-Institut fuer Chemie
Jonathan B. Betts: Los Alamos National Laboratory
Mari Einaga: Osaka University
Katsuya Shimizu: Osaka University
Mikhail I. Eremets: Max-Planck-Institut fuer Chemie
Luis Balicas: Florida State University
Fedor F. Balakirev: Los Alamos National Laboratory

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract The discovery of superconductivity at 260 K in hydrogen-rich compounds like LaH10 re-invigorated the quest for room temperature superconductivity. Here, we report the temperature dependence of the upper critical fields μ0Hc2(T) of superconducting H3S under a record-high combination of applied pressures up to 160 GPa and fields up to 65 T. We find that Hc2(T) displays a linear dependence on temperature over an extended range as found in multigap or in strongly-coupled superconductors, thus deviating from conventional Werthamer, Helfand, and Hohenberg (WHH) formalism. The best fit of Hc2(T) to the WHH formalism yields negligible values for the Maki parameter α and the spin–orbit scattering constant λSO. However, Hc2(T) is well-described by a model based on strong coupling superconductivity with a coupling constant λ ~ 2. We conclude that H3S behaves as a strong-coupled orbital-limited superconductor over the entire range of temperatures and fields used for our measurements.

Date: 2019
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DOI: 10.1038/s41467-019-10552-y

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