Synthesis of Superconducting Cobalt Trihydride

Miriam Pena Alvarez, Bin Li, Liam Kelsall, Jack Binns, Philip Dalladay-Simpson, Andreas Hermann, Ross Howie, Eugene Gregoryanz

Research output: Contribution to journalArticlepeer-review

Abstract

The Co-H system has been investigated through high-pressure high-temperature x-ray diffraction experiments combined with first principles calculations. On compression of elemental cobalt in a hydrogen medium, we observe fcc cobalt hydride (CoH) and cobalt dihydride (CoH2) at 33 GPa. Laser heating CoH2 in a hydrogen matrix at 75 GPa to temperatures in excess of 800 K, produces cobalt trihydride (CoH3) which adopts a primitive structure. Density functional theory calculations support the stability of CoH3. This phase is predicted to be thermodynamically stable at pressures above 18 GPa and to be a superconductor below 23 K as critical temperature, Tc. Theory predicts that this phase remains dynamically stable upon decompression above 11 GPa where it has a maximum Tc of 30 K.
Original languageEnglish
Pages (from-to)6420-6425
Number of pages6
JournalThe Journal of Physical Chemistry Letters
Volume11
Issue number15
Early online date13 Jul 2020
DOIs
Publication statusPublished - 6 Aug 2020

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