Probing nodeless superconductivity in LaMSi (M = Ni, Pt) using muon-spin rotation and relaxation

Systems with strong spin-orbit coupling have been a topic of fundamental interest in condensed matter physics due to the exotic topological phases and the unconventional phenomenon they exhibit. In this particular study, we have investigated the superconductivity in the transition-metal ternary nonc...

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Bibliographic Details
Published in:Physical review. B 2020-09, Vol.102 (9), p.1
Main Authors: P, Sajilesh K, Singh, D, Hillier, A D, Singh, R P
Format: Article
Language:English
Subjects:
Condensed matter physics
Coupling (molecular)
Depolarization
Muon spin relaxation
Muon spin rotation
Nickel compounds
Spin-orbit interactions
Superconductivity
Symmetry
Transition metals
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Summary:Systems with strong spin-orbit coupling have been a topic of fundamental interest in condensed matter physics due to the exotic topological phases and the unconventional phenomenon they exhibit. In this particular study, we have investigated the superconductivity in the transition-metal ternary noncentrosymmetric compounds LaMSi (M = Ni, Pt) with different spin-orbit coupling strength, using muon-spin rotation and relaxation measurements. Transverse-field measurements made in the vortex state 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. Zero-field measurements suggest a time-reversal symmetry preserved superconductivity in both the systems, though a small increase in muon depolarization is observed upon decreasing temperature. However, this has been attributed to quasistatic electronic fluctuations.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.094515