Local electronic structure rearrangements and strong anharmonicity in YH3 under pressures up to 180 GPa

Purans, J. (author): University of Latvia,National Research Nuclear University MEPhI

Klementiev, K. V. (author): Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory

Pascarelli, S. (author): European Synchrotron Radiation Facility,European XFEL GmbH

(creator_code:org_t)

2021-03-19
2021
English.
In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 12:1

Related links:: http://dx.doi.org/10... (free); show more...; https://www.nature.c...; https://lup.lub.lu.s...; https://doi.org/10.1...; show less...

Abstract Subject headings

The discovery of superconductivity above 250 K at high pressure in LaH10 and the prediction of overcoming the room temperature threshold for superconductivity in YH10 urge for a better understanding of hydrogen interaction mechanisms with the heavy atom sublattice in metal hydrides under high pressure at the atomic scale. Here we use locally sensitive X-ray absorption fine structure spectroscopy (XAFS) to get insight into the nature of phase transitions and the rearrangements of local electronic and crystal structure in archetypal metal hydride YH3 under pressure up to 180 GPa. The combination of the experimental methods allowed us to implement a multiscale length study of YH3: XAFS (short-range), Raman scattering (medium-range) and XRD (long-range). XANES data evidence a strong effect of hydrogen on the density of 4d yttrium states that increases with pressure and EXAFS data evidence a strong anharmonicity, manifested as yttrium atom vibrations in a double-well potential.

By the author/editor: Purans, J.; Menushenkov, A. ...; Besedin, S. P.; Ivanov, A. A.; Minkov, V. S.; Pudza, I.; show more...; Kuzmin, A.; Klementiev, K. V ...; Pascarelli, S.; Mathon, O.; Rosa, A. D.; Irifune, T.; Eremets, M. I.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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