Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

Panpan Kong, Vasily S. Minkov, Mikhail A. Kuzovnikov, Alexander P. Drozdov, Stanislav P. Besedin, Shirin Mozaffari, Luis Balicas, Fedor Fedorovich Balakirev, Vitali B. Prakapenka, Stella Chariton, Dmitry A. Knyazev, Eran Greenberg and Mikhail I. Eremets ()
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Panpan Kong: Max-Planck-Institut für Chemie
Vasily S. Minkov: Max-Planck-Institut für Chemie
Mikhail A. Kuzovnikov: Institute of Solid State Physics Russian Academy of Sciences
Alexander P. Drozdov: Max-Planck-Institut für Chemie
Stanislav P. Besedin: Max-Planck-Institut für Chemie
Shirin Mozaffari: Florida State University
Luis Balicas: Florida State University
Fedor Fedorovich Balakirev: NHMFL, Los Alamos National Laboratory, MS E536
Vitali B. Prakapenka: University of Chicago
Stella Chariton: University of Chicago
Dmitry A. Knyazev: Max-Planck-Institut für Mikrostrukturphysik
Eran Greenberg: University of Chicago
Mikhail I. Eremets: Max-Planck-Institut für Chemie

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract The discovery of superconducting H3S with a critical temperature Tc∼200 K opened a door to room temperature superconductivity and stimulated further extensive studies of hydrogen-rich compounds stabilized by high pressure. Here, we report a comprehensive study of the yttrium-hydrogen system with the highest predicted Tcs among binary compounds and discuss the contradictions between different theoretical calculations and experimental data. We synthesized yttrium hydrides with the compositions of YH3, YH4, YH6 and YH9 in a diamond anvil cell and studied their crystal structures, electrical and magnetic transport properties, and isotopic effects. We found superconductivity in the Im-3m YH6 and P63/mmc YH9 phases with maximal Tcs of ∼220 K at 183 GPa and ∼243 K at 201 GPa, respectively. Fm-3m YH10 with the highest predicted Tc > 300 K was not observed in our experiments, and instead, YH9 was found to be the hydrogen-richest yttrium hydride in the studied pressure and temperature range up to record 410 GPa and 2250 K.

Date: 2021
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DOI: 10.1038/s41467-021-25372-2

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