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Probing the superconducting ground state of the rare-earth ternary boride superconductors RRuB2 (R= Lu,Y) using muon-spin rotation and relaxation
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Barker, Joel, Singh, R. P., Hillier, A. D. and Paul, Don McK. (2018) Probing the superconducting ground state of the rare-earth ternary boride superconductors RRuB2 (R= Lu,Y) using muon-spin rotation and relaxation. Physical Review B, 97 (9). 094506. doi:10.1103/PhysRevB.97.094506 ISSN 2469-9950.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.97.094506
Abstract
The superconductivity in the rare-earth transition-metal ternary borides RRuB2 (where R = Lu and Y) has been investigated using muon-spin rotation and relaxation. Measurements made in zero field suggest that time-reversal symmetry is preserved upon entering the superconducting state in both materials; a small difference in depolarization is observed above and below the superconducting transition in both compounds, however, this has been attributed to quasistatic magnetic fluctuations. Transverse-field measurements of the flux-line lattice indicate that the superconductivity in both materials is fully gapped, with a conventional s-wave pairing symmetry and BCS-like magnitudes for the zero-temperature gap energies. The electronic properties of the charge carriers in the superconducting state have been calculated, with effective masses m∗/me = 9.8 ± 0.1 and 15.0 ± 0.1 in the Lu and Y compounds, respectively, with superconducting carrier densities ns = (2.73 ± 0.04) × 10^28 m^(−3) and (2.17 ± 0.02) × 10^28 m^(−3). The materials have been classified according to the Uemura scheme for superconductivity, with values for Tc/TF of 1/(414 ± 6) and 1/(304 ± 3), implying that the superconductivity may not be entirely conventional in nature.
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): | Rare earth borides, Superconductivity, Muon spin rotation, Transition metals | ||||||||||
Journal or Publication Title: | Physical Review B | ||||||||||
Publisher: | American Physical Society | ||||||||||
ISSN: | 2469-9950 | ||||||||||
Official Date: | 1 March 2018 | ||||||||||
Dates: |
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Volume: | 97 | ||||||||||
Number: | 9 | ||||||||||
Article Number: | 094506 | ||||||||||
DOI: | 10.1103/PhysRevB.97.094506 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Copyright Holders: | American Physical Society | ||||||||||
Date of first compliant deposit: | 20 April 2018 | ||||||||||
Date of first compliant Open Access: | 23 April 2018 | ||||||||||
RIOXX Funder/Project Grant: |
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