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  High-temperature superconductivity in hydrides: experimental evidence and details

Eremets, M. I., Minkov, V. S., Drozdov, A. P., Kong, P. P., Ksenofontov, V., Shylin, S. I., et al. (2022). High-temperature superconductivity in hydrides: experimental evidence and details.

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Eremets, M. I.1, Author              
Minkov, V. S.1, Author              
Drozdov, A. P.1, Author              
Kong, P. P.1, Author              
Ksenofontov, V.1, Author              
Shylin, S. I., Author
Bud'ko, S. L. , Author
Prozorov, R., Author
Balakirev, F. F., Author
Sun, Dan, Author
Mozaffari, S., Author
Balicas, L., Author
Affiliations:
1High Pressure Group, Max Planck Institute for Chemistry, Max Planck Society, ou_1826289              

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 Abstract: Since the discovery of superconductivity at 200 K in H3S [1] similar or higher transition temperatures, Tcs, have been reported for various hydrogen-rich compounds under ultra-high pressures [2]. Superconductivity was experimentally proved by different methods, including electrical resistance, magnetic susceptibility, optical infrared, and nuclear resonant scattering measurements. The crystal structures of superconducting phases were determined by X-ray diffraction. Numerous electrical transport measurements demonstrate the typical behaviour of a conventional phonon-mediated superconductor: zero resistance below Tc, the shift of Tc to lower temperatures under external magnetic fields, and pronounced isotope effect. Remarkably, the results are in good agreement with the theoretical predictions, which describe superconductivity in hydrides within the framework of the conventional BCS theory. However, despite this acknowledgment, experimental evidence for the superconducting state in these compounds has recently been treated with criticism [3, 4], which apparently stems from misunderstanding and misinterpretation of complicated experiments performed under very high pressures. Here, we describe in greater detail the experiments revealing high-temperature superconductivity in hydrides under high pressures. We show that the arguments against superconductivity [3, 4] can be either refuted or explained. The experiments on the high-temperature superconductivity in hydrides clearly contradict the theory of hole superconductivity [4] and eliminate it [3].

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Language(s): eng - English
 Dates: 2022-01-13
 Publication Status: Published online
 Pages: 17
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2201.05137
 Degree: -

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