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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://elar.urfu.ru/handle/10995/103330 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85096333029 |
WOS ID: | 000584292800001 |
PURE ID: | a3d900d2-2a0c-462c-8012-5ec3ad46aad8 20117683 |
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. |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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