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Superconductivity and the upper critical field in the chiral noncentrosymmetric superconductor NbRh2B2
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Mayoh, Daniel, Pearce, Matthew J., Götze, K., Hillier, A. D. (Adrian D.), Balakrishnan, Geetha and Lees, Martin R. (2019) Superconductivity and the upper critical field in the chiral noncentrosymmetric superconductor NbRh2B2. Journal of Physics: Condensed Matter, 31 (46). 465601. doi:10.1088/1361-648X/ab348b ISSN 0953-8984.
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Official URL: http://dx.doi.org/10.1088/1361-648X/ab348b
Abstract
NbRh2B2 crystallises in a chiral noncentrosymmetric structure and exhibits bulk type-II superconductivity below 7.46(5) K. Here we show that the temperature dependence of the upper critical field deviates from the behaviour expected for both Werthamer-Helfand-Hohenberg and the Ginzburg-Landau models and that μ0Hc2 (0) ~ 18 T exceeds the Pauli paramagnetic limit, μ0HP = 13.9 T. We explore the reasons for this enhancement. Transverse-field muon spectroscopy measurements suggest that the superconducting gap is either s-wave or (s + s)-wave, a the pressure dependence of Tc reveals the superconducting gap is primarily s- wave in character. The magnetic penetration depth lambda(0) = 595(5) nm. Heat capacity measurements reveal the presence of a multigap (s + s)-wave superconducting order parameter and moderate electron-phonon coupling.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Library of Congress Subject Headings (LCSH): | Superconductors, Superconductivity, Superconductors -- Thermal properties , Muon spin rotation | ||||||||||
Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||||||||
Publisher: | Institute of Physics | ||||||||||
ISSN: | 0953-8984 | ||||||||||
Official Date: | 19 August 2019 | ||||||||||
Dates: |
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Volume: | 31 | ||||||||||
Number: | 46 | ||||||||||
Article Number: | 465601 | ||||||||||
DOI: | 10.1088/1361-648X/ab348b | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Reuse Statement (publisher, data, author rights): | “This is an author-created, un-copyedited version of an article published in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/1361-648X/ab348b” | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Copyright Holders: | Institute of Physics Publishing Ltd | ||||||||||
Date of first compliant deposit: | 21 August 2019 | ||||||||||
Date of first compliant Open Access: | 21 August 2019 | ||||||||||
RIOXX Funder/Project Grant: |
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