Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/103334
Title: An approach to identifying unconventional superconductivity in highly-compressed superconductors
Authors: Talantsev, E. F.
Issue Date: 2020
Publisher: IOP Publishing Ltd
Citation: Talantsev E. F. An approach to identifying unconventional superconductivity in highly-compressed superconductors / E. F. Talantsev. — DOI 10.1088/1361-6668/abb11a // Superconductor Science and Technology. — 2020. — Vol. 33. — Iss. 12. — 124001.
Abstract: Since the milestone experimental discovery by Drozdov et al( 2015 Nature 525 73-6) who reported the observation of near-room-temperature (NRT) superconductivity in highly-compressed sulphur hydride, the quest for room-temperature superconductivity is primarily focused on highly-compressed materials. Extreme conditions and space confinement inside a diamond anvil cell (DAC) dramatically limits the number of experimental techniques which can be applied to study highly-compressed superconductors. For this reason, the development of new approaches to characterize materials at extreme conditions is one of the central topics in the field of NRT superconductivity. In this paper, we describe an approach to categorize highly-compressed superconductors, including NRT superconductors, as unconventional superconductors. The primary idea for the classification is based on the empirical finding of Uemura (1997 Physica C 282-7 197) who showed that all unconventional superconductors have the ratio of the superconducting transition temperature, T c, to the Fermi temperature, T F, within a range of 0.01 ≤ T c/T F ≤ 0.05. To deduce the Fermi temperature in highly-compressed superconductors, we utilize temperature dependence of the upper critical field and the resistance data (which both can be more or less routinely measured for highly-compressed superconductors) and reported results by first principles calculations for these materials. We demonstrate the application of the approach for highly-compressed oxygen, sulphur, lithium, and recently discovered yttrium superhydride polymorphs, YHn( n = 4,6,7,9) (Troyan et al( 2019 arXiv:1908.01534) and Kong et al( 2019 arXiv:1909.10482)). We also show the application of the approach for the newly discovered uncompressed Nd2-xSrxNiO2 nickelate superconductor. © 2020 IOP Publishing Ltd.
Keywords: HIGH-PRESSURE SUPERCONDUCTORS
UNCONVENTIONAL SUPERCONDUCTIVITY
UPPER CRITICAL FIELD
CALCULATIONS
NEODYMIUM COMPOUNDS
NICKEL COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTING TRANSITION TEMPERATURE
TEMPERATURE DISTRIBUTION
YTTRIUM COMPOUNDS
DIAMOND-ANVIL CELL
EXPERIMENTAL TECHNIQUES
FIRST-PRINCIPLES CALCULATION
NEAR ROOM TEMPERATURE
TEMPERATURE DEPENDENCE
UNCONVENTIONAL SUPERCONDUCTIVITY
UNCONVENTIONAL SUPERCONDUCTORS
UPPER CRITICAL FIELDS
SUPERCONDUCTING MATERIALS
URI: http://hdl.handle.net/10995/103334
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85096288261
PURE ID: 20118066
3a87e185-f20e-4071-9171-efe335d432d8
ISSN: 9532048
DOI: 10.1088/1361-6668/abb11a
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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