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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
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 | ||||||||
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| Subjects: | Q Science > QC Physics | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | Physical Review B | ||||||||
| Publisher: | American Physical Society | ||||||||
| ISSN: | 2469-9950 | ||||||||
| Official Date: | 10 September 2018 | ||||||||
| Dates: |
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| 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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