Probing the superconducting pairing of the La₄Be₃₃Pt₁₆ alloy via muon-spin spectroscopy
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Date
2024-03-13Type
- Journal Article
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Abstract
We report a study of the superconducting pairing of the noncentrosymmetric La4Be33Pt16 alloy using muon-spin rotation and relaxation (mu SR) technique. Below K, La4Be33Pt16 exhibits bulk superconductivity (SC), here characterized by heat-capacity and magnetic-susceptibility measurements. The temperature dependence of the superfluid density rho(sc)(T), extracted from the transverse-field mu SR measurements, reveals a nodeless SC in La4Be33Pt16. The best fit of rho(sc)(T) using an s-wave model yields a magnetic penetration depth nm and a superconducting gap meV at zero Kelvin. The single-gapped superconducting state is further evidenced by the temperature-dependent electronic specific heat C-e(T)/T and the linear field-dependent electronic specific-heat coefficient gamma(H)(H). The zero-field mu SR spectra collected in the normal- and superconducting states of La4Be33Pt16 are almost identical, confirming the absence of an additional field-related relaxation and, thus, of spontaneous magnetic fields below T-c. The nodeless SC combined with a preserved time-reversal symmetry in the superconducting state proves that the spin-singlet pairing is dominant in La4Be33Pt16. This material represents yet another example of a complex system showing only a conventional behavior, in spite of a noncentrosymmetric structure and a sizeable spin-orbit coupling. Show more
Publication status
publishedExternal links
Journal / series
Journal of Physics: Condensed MatterVolume
Pages / Article No.
Publisher
IOP PublishingSubject
noncentrosymmetric superconductor; muon-spin rotation and relaxation; fully-gapped superconductivityFunding
169455 - Exotic matter and correlated quantum phenomena (SNF)
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Is supplemented by: http://lmu.web.psi.ch/musrfit/technical
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