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High-temperature superconductivity in hydrides

  a,  b,  a,   b,  b, §  c,  c, *  d, c, e, #  a, °  b
a Federal Scientific Research Center "Crystallography and Photonics", Russian Academy of Sciences, Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii prosp. 59, Moscow, 119333, Russian Federaion
b Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow, 121205, Russian Federation
c Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
d Moscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141701, Russian Federation
e National Research University Higher School of Economics, ul. Myasnitskaya 20, Moscow, 101000, Russian Federation

Over the past six years (2015—2021), many superconducting hydrides with critical temperatures Tc up +15ˆC, which are currently record high, have been discovered. Now, we can already say that a special field of superconductivity has developed: hydride superconductivity at ultrahigh pressures. For the most part, the properties of superhydrides are well described by the Migdal—Eliashberg theory of strong electron—phonon interactions, especially when the anharmonicity of phonons is taken into account. We investigate the isotope effect, the effect of a magnetic field (up to 60—70 T) on the critical temperature and critical current in the hydride samples, and the dependence of Tc on the pressure and the degree of doping. The divergences between the theory and experiment are of interest, especially in the regions of phase stability and in the behavior of the upper critical magnetic fields at low temperatures. We present a retrospective analysis of data from 2015—2021 and describe promising directions for future research on hydride superconductivity.

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Fulltext is also available at DOI: 10.3367/UFNe.2021.05.039187
Keywords: high-temperature superconductivity, high pressures, hydrides
PACS: 74.25.−q, 74.70.−b (all)
DOI: 10.3367/UFNe.2021.05.039187
URL: https://ufn.ru/en/articles/2022/7/h/
Citation: Troyan I A, Semenok D V, Ivanova A G, Kvashnin A G, Zhou D, Sadakov A V, Sobolevsky O A, Pudalov V M, Lyubutin I S, Oganov A R "High-temperature superconductivity in hydrides" Phys. Usp. 65 748–761 (2022)
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Received: 12th, May 2021, 12th, May 2021

Оригинал: Троян И А, Семенок Д В, Иванова А Г, Квашнин А Г, Чжоу Д, Садаков А В, Соболевский О А, Пудалов В М, Любутин И С, Оганов А Р «Высокотемпературная сверхпроводимость в гидридах» УФН 192 799–813 (2022); DOI: 10.3367/UFNr.2021.05.039187

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