Actinium Hydrides AcH10, AcH12, and AcH16 as Higherature Conventional Superconductors

Dmitrii V. Semenok, Alexander G. Kvashnin, Ivan A. Kruglov, Artem R. Oganov

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)

Abstract

The stability of numerous unexpected actinium hydrides was predicted via the evolutionary algorithm USPEX. The electron-phonon interaction was investigated for the hydrogen-richest and most symmetric phases: R3Ìm-AcH10, I4/mmm-AcH12, and P6Ìm2-AcH16. Predicted structures of actinium hydrides are consistent with all previously studied Ac-H phases and demonstrate phonon-mediated higherature superconductivity with TC in the range of 204-251 K for R3Ìm-AcH10 at 200 GPa and 199-241 K for P6Ìm2-AcH16 at 150 GPa, which was estimated by directly solving the Eliashberg equation. Actinium belongs to the series of d1 elements (Sc-Y-La-Ac) that form high-TC superconducting (HTSC) hydrides. Combining this observation with previous predictions of p0-HTSC hydrides (MgH6 and CaH6), we propose that p0 and d1 metals with low-lying empty orbitals tend to form phonon-mediated HTSC metal polyhydrides.

Original languageEnglish
Pages (from-to)1920-1926
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume9
Issue number8
DOIs
Publication statusPublished - 19 Apr 2018

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