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Superconducting and normal-state properties of the noncentrosymmetric superconductor Re₆Zr
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Mayoh, Daniel, Barker, Joel, Singh, R. P., Balakrishnan, Geetha, Paul, Don McK. and Lees, Martin R. (2017) Superconducting and normal-state properties of the noncentrosymmetric superconductor Re₆Zr. Physical Review B (Condensed Matter and Materials Physics), 96 (6). 064521. doi:10.1103/PhysRevB.96.064521
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Official URL: https://doi.org/10.1103/PhysRevB.96.064521
Abstract
We systematically investigate the normal and superconducting properties of noncentrosymmetric Re6Zr using magnetization, heat capacity, and electrical resistivity measurements. Resistivity measurements indicate Re6Zr has poor metallic behavior and is dominated by disorder. Re6Zr undergoes a superconducting transition at Tc = (6.75 ± 0.05) K. Magnetization measurements give a lower critical field, μ0Hc1 = (10.3 ± 0.1) mT. The Werthamer-Helfand-Hohenberg model is used to approximate the upper critical field μ0Hc2 = (11.2 ± 0.2) T, which is close to the Pauli limiting field of 12.35 T and which could indicate singlet-triplet mixing. However, low-temperature specific-heat data suggest that Re6Zr is an isotropic, fully gapped s-wave superconductor with enhanced electron-phonon coupling. Unusual flux pinning resulting in a peak effect is observed in the magnetization data, indicating an unconventional vortex state.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Superconductors, Superconductivity, Fermi surfaces | ||||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 2469-9950 | ||||||
| Official Date: | 17 August 2017 | ||||||
| Dates: |
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| Volume: | 96 | ||||||
| Number: | 6 | ||||||
| Article Number: | 064521 | ||||||
| DOI: | 10.1103/PhysRevB.96.064521 | ||||||
| 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 and EP/M028771/1 |
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