Study of Nb0:18Re0:82 non-centrosymmetric superconductor in the normal and superconducting states

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Title: Study of Nb0:18Re0:82 non-centrosymmetric superconductor in the normal and superconducting states
Authors: Sundar, S
Salem-Sugui, S
Chattopadhyay, MK
Roy, SB
Sharath Chandra, LS
Cohen, L
Ghivelder, L
Item Type: Journal Article
Abstract: We examine the evidence for multiband superconductivity and non s-wave pairing in the non-centrosymmetric superconductor Nb0.18Re0.82, using electrical transport, magnetization and spe-cific heat measurements. In the normal state, the evolution of electrical resistivity with temperatureand magnetic field support the phonon assisted interband scattering and multiband picture. Inthe superconducting state, the temperature dependence of the upper critical field,Hc2(T), is foundlinear and can not be described within the Werthamer, Helfand and Hohenberg (WHH) model overthe whole temperature range measured. In addition, the observedHc2(0) exceeds the Pauli limit,suggesting non-s-wave pairing. Interestingly, the Kadowaki-Woods ratio and Uemura plot reveala behavior in Nb0.18Re0.82which is similar to that found in unconventional superconductors. Thenormalized superfluid density (ρs), estimated using the temperature dependence of the lower criticalfield,Hc1(T), is well explained with the help of the multiband description. Phase-fluctuation analysisconducted on the reversible magnetization data, reveals a significant deviation from the mean-fieldconventional s-wave behavior. This trend is interpreted in terms of a non s-wave spin-triplet com-ponent in the pairing symmetry as might be anticipated in a non-centrosymmetric superconductorwhere anti-symmetric spin-orbit coupling plays a dominant role. Recently, time reversal symmetrybreaking (TRSB) observed in Nb0.18Re0.82supports this picture.
Issue Date: 29-Mar-2019
Date of Acceptance: 12-Feb-2019
URI: http://hdl.handle.net/10044/1/67439
DOI: https://doi.org/10.1088/1361-6668/ab06a5
ISSN: 0953-2048
Publisher: IOP Publishing
Start Page: 1
End Page: 11
Journal / Book Title: Superconductor Science and Technology
Volume: 32
Issue: 5
Copyright Statement: © 2019 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Superconductor Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://doi.org/10.1088/1361-6668/ab06a5.
Sponsor/Funder: The Leverhulme Trust
Funder's Grant Number: RPG-2016-306
Keywords: Science & Technology
Physical Sciences
Physics, Applied
Physics, Condensed Matter
Physics
non-centrosymmetric superconductors
unconventional superconductor
magnetoresistance
multiband superconductor
pairing symmetry
critical fields
SPIN-FLUCTUATIONS
CRITICAL FIELD
CONDUCTIVITY
TEMPERATURE
RESISTIVITY
DEPENDENCE
TRANSITION
0204 Condensed Matter Physics
0912 Materials Engineering
0906 Electrical and Electronic Engineering
General Physics
Publication Status: Published
Embargo Date: 2020-03-29
Online Publication Date: 2019-03-29
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences



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