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

“Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure” (2021), by P. P. Kong et al. Earth and Planetary Sciences research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: P. P. Kong, Vasily S. Minkov, Mikhail A. Kuzovnikov, Alexander P. Drozdov, Stanislav P. Besedin, Shirin Mozaffari, Luis Balicas, Fedor Balakirev, Vitali B. Prakapenka, Stella Chariton et al.
- Published: August 20, 2021
- Field: Earth and Planetary Sciences
- DOI: https://doi.org/10.1038/s41467-021-25372-2
- Free PDF: https://www.nature.com/articles/s41467-021-25372-2.pdf

## Abstract

The discovery of superconducting H 3 S 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 c s among binary compounds and discuss the contradictions between different theoretical calculations and experimental data. We synthesized yttrium hydrides with the compositions of YH 3 , YH 4 , YH 6 and YH 9 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 YH 6 and P6 3 /mmc YH 9 phases with maximal T c s of ∼220 K at 183 GPa and ∼243 K at 201 GPa, respectively. Fm-3m YH 10 with the highest predicted T c > 300 K was not observed in our experiments, and instead, YH 9 was found to be the hydrogen-richest yttrium hydride in the studied pressure and temperature range up to record 410 GPa and 2250 K.

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