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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

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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
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:
DateEvent
17 August 2017Published
17 August 2017Accepted
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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