Superconductivity at 161 K in thorium hydride ThH10: Synthesis and properties

Dmitry V. Semenok, Alexander G. Kvashnin, Anna G. Ivanova, Volodymyr Svitlyk, Vyacheslav Yu Fominski, Andrey V. Sadakov, Oleg A. Sobolevskiy, Vladimir M. Pudalov, Ivan A. Troyan, Artem R. Oganov

Research output: Contribution to journalArticlepeer-review

127 Citations (Scopus)

Abstract

Here we report targeted high-pressure synthesis of two novel high-TC hydride superconductors, P63/mmc-ThH9 and Fm3-m-ThH10, with the experimental critical temperatures (TC) of 146 K and 159–161 K and upper critical magnetic fields (μHC) 38 and 45 Tesla at pressures 170–175 Gigapascals, respectively. Superconductivity was evidenced by the observation of zero resistance and a decrease of TC under external magnetic field up to 16 Tesla. This is one of the highest critical temperatures that has been achieved experimentally in any compound, along with such materials as LaH10, H3S and HgBa2CaxCu2O6+ z. Our experiments show that fcc-ThH10 has stabilization pressure of 85 GPa, making this material unique among all known high-TC metal polyhydrides. Two recently predicted Th-H compounds, I4/mmm-ThH4 (>86 GPa) and Cmc21-ThH6 (86–104 GPa), were also synthesized. Equations of state of obtained thorium polyhydrides were measured and found to be in excellent agreement with the theoretical calculations. New phases were examined theoretically and their electronic, phonon, and superconducting properties were calculated.

Original languageEnglish
Pages (from-to)36-44
Number of pages9
JournalMaterials Today
Volume33
DOIs
Publication statusPublished - Mar 2020

Keywords

  • High pressure
  • Superconductivity
  • Thorium hydrides
  • USPEX
  • X-ray diffraction

Fingerprint

Dive into the research topics of 'Superconductivity at 161 K in thorium hydride ThH10: Synthesis and properties'. Together they form a unique fingerprint.

Cite this