Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/103330
Title: Double-valued strong-coupling corrections to Bardeen-Cooper-Schrieffer ratios
Authors: Talantsev, E. F.
Issue Date: 2020
Publisher: IOP Publishing Ltd
Citation: Talantsev E. F. Double-valued strong-coupling corrections to Bardeen-Cooper-Schrieffer ratios / E. F. Talantsev. — DOI 10.1088/1361-6668/abbb19 // Superconductor Science and Technology. — 2020. — Vol. 33. — Iss. 12. — 124003.
Abstract: The experimental discovery of near-room-temperature (NRT) superconductivity in highlycompressed H3S, LaH10 and YH6 has restored fundamental interest in the electron-phonon pairing mechanism in superconductors. One of the prerequisites of phonon-mediated NRT superconductivity in highly compressed hydrides is strong electron-phonon interactions, which can be quantified by dimensionless ratios of the Bardeen-Cooper-Schrieffer (BCS) theory vs variable, where Tc is the critical temperature and ωln is the logarithmic phonon frequency (Mitrovic et al 1984 Phys. Rev. B 29 184). However, all known strong-coupling correction functions for the BCS ratios are applicable for < 0.20, which is not a high enough range for NRT superconductors, because the latter exhibit variable values of 0.13 < < 0.32. In this paper, we reanalyze the full experimental dataset (including data for highly compressed H3S) and find that the strong-coupling correction functions for the gap-to-critical-temperature ratio and for the specific-heat-jump ratio are double-valued nearly linear functions of . © 2020 IOP Publishing Ltd.
Keywords: GAP-TO-CRITICAL-TEMPERATURE RATIO
HIGHLY-COMPRESSED SULPHUR HYDRIDE
SPECIFIC-HEAT-JUMP RATIO
STRONG-COUPLING CORRECTION FUNCTIONS FOR BCS THEORY
ELECTRON-PHONON INTERACTIONS
SPECIFIC HEAT
SUPERCONDUCTING MATERIALS
TEMPERATURE
BARDEEN-COOPER-SCHRIEFFER
BARDEEN-COOPER-SCHRIEFFER THEORY
CRITICAL TEMPERATURES
DIMENSIONLESS RATIOS
LINEAR FUNCTIONS
NEAR ROOM TEMPERATURE
PAIRING MECHANISM
PHONON FREQUENCIES
LANTHANUM COMPOUNDS
URI: http://hdl.handle.net/10995/103330
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85096333029
PURE ID: 20117683
a3d900d2-2a0c-462c-8012-5ec3ad46aad8
ISSN: 9532048
DOI: 10.1088/1361-6668/abbb19
metadata.dc.description.sponsorship: The author acknowledges financial support provided by the Ministry of Education and Science of the Russian Federation (theme 'Pressure' No. AAAA-A18-118020190104-3) and by Act 211 Government of the Russian Federation, contract No. 02.A03.21.0006.
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