Study of Nb0:18Re0:82 non-centrosymmetric superconductor in the normal and superconducting states
File(s)
Accepted version
Author(s)
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.
Date Issued
2019-03-29
Date Acceptance
2019-02-12
Citation
Superconductor Science and Technology, 2019, 32 (5), pp.1-11
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
The Leverhulme Trust
Identifier
https://iopscience.iop.org/article/10.1088/1361-6668/ab06a5
Grant Number
RPG-2016-306
Subjects
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
Date Publish Online
2019-03-29