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Investigation of superconducting gap structure in HfIrSi using muon spin relaxation/rotation
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Bhattacharyya, A., Panda, K., Adroja, D. T., Kase, N., Biswas, P. K. (Pabitra K.), Saha, Surabhi, Das, Tanmoy, Lees, Martin R. and Hillier, A. D. (2019) Investigation of superconducting gap structure in HfIrSi using muon spin relaxation/rotation. Journal of Physics: Condensed Matter, 32 (8). 085601. doi:10.1088/1361-648X/ab549e ISSN 0953-8984.
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Official URL: http://dx.doi.org/10.1088/1361-648X/ab549e
Abstract
We have investigated the superconducting state of HfIrSi using magnetization, specific heat, muon spin rotation and relaxation (SR) measurements. Superconductivity was observed at T_C = 3.6(1) K in both specific heat and magnetization measurements. From an analysis of the transverse-field μSR data, it is clear that the temperature variation of superfluid density is well fitted by an isotropic Bardeen–Cooper–Schrieffer (BCS) type s-wave gap structure. The superconducting carrier density n_s = 6.6(1) × 10^26 m^−3, the magnetic penetration depth, λ_L(0) = 259(4) nm, and the effective mass, m* = 1.57(3) me, were calculated from the TF-SR data. Zero-field μSR data for HfIrSi reveal the absence of any spontaneous magnetic moments below , indicating that time-reversal symmetry (TRS) is preserved in the superconducting state of HfIrSi. Theoretical investigations suggest that the Hf and Ir atoms hybridize strongly along the c-axis, and that this is responsible for the strong three-dimensionality of this system which screens the Coulomb interaction. As a result, despite the presence of d-electrons in HfIrSi, these correlation effects are weakened, making the electron-phonon coupling more important.
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, Ternary , Superconductivity, Muons , Muon spin rotation | ||||||||||||||||||||||||
Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||||||||||||||||||||||
Publisher: | Institute of Physics | ||||||||||||||||||||||||
ISSN: | 0953-8984 | ||||||||||||||||||||||||
Official Date: | 20 November 2019 | ||||||||||||||||||||||||
Dates: |
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Volume: | 32 | ||||||||||||||||||||||||
Number: | 8 | ||||||||||||||||||||||||
Article Number: | 085601 | ||||||||||||||||||||||||
DOI: | 10.1088/1361-648X/ab549e | ||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This is an author-created, un-copyedited version of an article accepted for publication/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/ab549e | ||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
Copyright Holders: | Institute of Physics Publishing Ltd | ||||||||||||||||||||||||
Date of first compliant deposit: | 13 February 2020 | ||||||||||||||||||||||||
Date of first compliant Open Access: | 20 November 2020 | ||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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