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

Kong, Panpan; Minkov, Vasily S.; Kuzovnikov, Mikhail A.; Drozdov, Alexander P.; Besedin, Stanislav P.; Mozaffari, Shirin; Balicas, Luis; Balakirev, Fedor Fedorovich; Prakapenka, Vitali B.; Chariton, Stella; Knyazev, Dmitry A.; Greenberg, Eran; Eremets I, Mikhail

doi:10.1038/s41467-021-25372-2

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

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Knyazev, Dmitry A.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Kong, P., Minkov, V. S., Kuzovnikov, M. A., Drozdov, A. P., Besedin, S. P., Mozaffari, S., et al. (2021). Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure. Nature Communications, 12: 5075. doi:10.1038/s41467-021-25372-2.

Cite as: https://hdl.handle.net/21.11116/0000-0009-2FC0-A

Abstract

The discovery of superconducting H₃S with a critical temperature T_c∼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 T_cs 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 T_cs of ∼220 K at 183 GPa and ∼243 K at 201 GPa, respectively. Fm-3m YH₁₀ with the highest predicted T_c > 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.