Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/103053
Title: The electron-phonon coupling constant, Fermi temperature and unconventional superconductivity in the carbonaceous sulfur hydride 190 K superconductor
Authors: Talantsev, E. F.
Issue Date: 2021
Publisher: IOP Publishing Ltd
Citation: Talantsev E. F. The electron-phonon coupling constant, Fermi temperature and unconventional superconductivity in the carbonaceous sulfur hydride 190 K superconductor / E. F. Talantsev. — DOI 10.1088/1361-6668/abd28e // Superconductor Science and Technology. — 2021. — Vol. 34. — Iss. 3. — 034001.
Abstract: Recently, Snider et al (2020 Nature 586 373) reported on the observation of superconductivity in highly compressed carbonaceous sulfur hydride, H x (S,C) y . The highest critical temperature in H x (S,C) y exceeds the previous record of T c = 280 K by 5 K, as reported by Somayazulu et al (2019 Phys. Rev. Lett. 122 027001) for highly compressed LaH10. In this paper, we analyze experimental temperature-dependent magnetoresistance data, R(T,B), reported by Snider et al. The analysis shows that H x (S,C) y compound exhibited T c = 190 K (P = 210 GPa), has the electron-phonon coupling constant λ e-ph = 2.0 and the ratio of critical temperature, T c, to the Fermi temperature, T F, in the range of 0.011 T c/T F 0.018. These deduced values are very close to the ones reported for H3S at P = 155-165 GPa (Drozdov et al 2015 Nature 525 73). This means that in all considered scenarios the carbonaceous sulfur hydride 190 K superconductor falls into the unconventional superconductor band in the Uemura plot, where all other highly compressed super-hydride/deuterides are located. It should be noted that our analysis shows that all raw R(T,B) data sets for H x (S,C) y samples, for which Snider et al (2020 Nature 586 373) reported T c > 200 K, cannot be characterized as reliable data sources. Thus, independent experimental confirmation/disproof for high-T c values in the carbonaceous sulfur hydride are required. © 2021 IOP Publishing Ltd.
Keywords: ELECTRON-PHONON COUPLING CONSTANT
HIGH-PRESSURE SUPERCONDUCTORS
HYDROGEN-BASED SUPERCONDUCTORS
ROOM-TEMPERATURE SUPERCONDUCTORS
UPPER CRITICAL FIELD
ELECTRON CORRELATIONS
HYDRIDES
HYDROGEN SULFIDE
SUPERCONDUCTING MATERIALS
TEMPERATURE
CRITICAL TEMPERATURES
ELECTRON-PHONON COUPLING CONSTANT
EXPERIMENTAL CONFIRMATION
FERMI TEMPERATURE
SUPERHYDRIDES
TEMPERATURE DEPENDENT
UNCONVENTIONAL SUPERCONDUCTIVITY
UNCONVENTIONAL SUPERCONDUCTORS
ELECTRON-PHONON INTERACTIONS
URI: http://hdl.handle.net/10995/103053
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85102150417
PURE ID: 20907854
ISSN: 9532048
DOI: 10.1088/1361-6668/abd28e
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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