Details

Autor(en) / Beteiligte

• Purans, J.
• Menushenkov, A. P.
• Besedin, S. P.
• Ivanov, A. A.
• Minkov, V. S.
• Pudza, I.
• Kuzmin, A.
• Klementiev, K. V.
• Pascarelli, S.
• Mathon, O.
• Rosa, A. D.
• Irifune, T.
• Eremets, M. I.

Titel

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

Ist Teil von

• Nature communications, 2021-03, Vol.12 (1), p.1765-1765, Article 1765

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The discovery of superconductivity above 250 K at high pressure in LaH 10 and the prediction of overcoming the room temperature threshold for superconductivity in YH 10 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 YH 3 under pressure up to 180 GPa. The combination of the experimental methods allowed us to implement a multiscale length study of YH 3 : XAFS (short-range), Raman scattering (medium-range) and XRD (long-range). XANES data evidence a strong effect of hydrogen on the density of 4 d yttrium states that increases with pressure and EXAFS data evidence a strong anharmonicity, manifested as yttrium atom vibrations in a double-well potential. The discovery of superconductivity in metal hydrides requires an understanding of hydrogen interactions with the heavy atom sublattice under high pressure. Here, the authors report evidence of a strong effect of hydrogen on the density increase of 4 d yttrium states and strong anharmonic vibrations of yttrium atoms in YH 3 .