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

MATERIALS TODAY

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Article

Semenok, Dmitry V.¹  Kvashnin, Alexander G.^1,2  Ivanova, Anna G.³  Svitlyk, Volodymyr⁴  Fominski, Vyacheslav Yu.⁵  Sadakov, Andrey V.⁶  Sobolevskiy, Oleg A.⁶  Pudalov, Vladimir M.⁶  Troyan, Ivan A.³  Oganov, Artem R.^1,2,7 

[1] Skolkovo Innovat Ctr, Skolkovo Inst Sci & Technol, 3 Nobel St, Moscow 121025, Russia

[2] Moscow Inst Phys & Technol, 9 Inst Sky Lane, Dolgoprudnyi 141700, Russia

[3] Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, Shubnikov Inst Crystallog, Moscow 119333, Russia

[4] ESRF, ID27 High Pressure Beamline, BP220, F-38043 Grenoble, France

[5] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Kashirskoe Sh 31, Moscow 115409, Russia

[6] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia

[7] Northwestern Polytech Univ, Int Ctr Mat Discovery, Xian 710072, Peoples R China

关键词: Thorium hydrides;    USPEX;    High pressure;    Superconductivity;    X-ray diffraction;   

DOI  :  10.1016/j.mattod.2019.10.005

来源: Elsevier

【 摘 要 】

Here we report targeted high-pressure synthesis of two novel high-T-C hydride superconductors, P6(3)/mmc-ThH9 and Fm (3) over barm-ThH10, with the experimental critical temperatures (T-C) of 146 K and 159-161 K and upper critical magnetic fields (mu H-C) 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 HgBa2Cax-Cu2O6+z. Our experiments show that fcc-ThH10 has stabilization pressure of 85 GPa, making this material unique among all known high-T-C metal polyhydrides. Two recently predicted Th-H compounds, I4/mmm-ThH4 (>86 GPa) and Cmc2(1)-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.

【 授权许可】

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