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Superconducting and normal-state properties of the noncentrosymmetric superconductor Re3Ta

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Barker, Joel, Breen, B. D., Hanson, Robert M., Hillier, A. D., Lees, Martin R., Balakrishnan, Geetha, Paul, D. McK. and Singh, R. P. (2018) Superconducting and normal-state properties of the noncentrosymmetric superconductor Re3Ta. Physical Review B, 98 (10). 104506. doi:10.1103/PhysRevB.98.104506

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Official URL: http://dx.doi.org/10.1103/PhysRevB.98.104506

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Abstract

The noncentrosymmetric superconductor, Re3Ta, has been characterized in detail with a combination of magnetization, heat capacity, and electrical resistivity measurements, as well as a microscopic investigation of the internal magnetic fields using muon spin spectroscopy (μSR). In low applied fields, we observe 100% flux expulsion at a temperature of Tc = 4.68 K, which is concomitant with a sudden decrease of the electrical resistivity to zero and a sharp discontinuity in the heat capacity, confirming bulk superconductivity in this material. We find that Re3Ta is a poor metal, with superconductivity occurring in the dirty limit, and in which the disorder in the structure dominates the physical properties. Zero-field μSR shows that the superconducting state preserves time-reversal symmetry, and transverse-field measurements of the superfluid density are well described by an isotropic s-wave model. A careful analysis of the internal field distribution reveals a high level of disorder in the vortex lattice. Furthermore, we have combined the experimental data and calculated the effective mass, carrier density, and electronic mean-free path in this material, and ultimately show that Re3Ta lies close to the unconventional region of the Uemura plot.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review B
Publisher: American Physical Society
ISSN: 2469-9950
Official Date: 10 September 2018
Dates:
DateEvent
10 September 2018Published
10 September 2018Accepted
12 February 2018Submitted
Volume: 98
Number: 10
Article Number: 104506
DOI: 10.1103/PhysRevB.98.104506
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Physical Society
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/I007210/1

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