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arXiv · 0809.1274

Magnetic response of noncentrosymmetric superconductor La2C3: Effect of double-gap and spin-orbit interaction

R. Kadono·M. Hiraishi·M. Miyazaki·K. H. Satoh·S. Takeshita·S. Kuroiwa·S. Saura·J. Akimitsu
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Abstract

The presence of spin-orbit (SO) interaction in a noncentrosymmetric superconductor, La2C3 (T_c~11 K) is demonstrated by muon spin rotation (muSR) in its normal state, where muSR spectra exhibit field-induced weak depolarization due to van Vleck-like local susceptibility. In the mixed state, muon spin relaxation due to inhomogeneity of internal field (sigma_v) exhibits a field dependence that is characterized by a kink, where sigma_v (and hence the superfluid density) is more strongly reduced at lower fields. This is perfectly in line with the presence of a secondary energy gap previously inferred from the temperature dependence of sigma_v, and also consistent with the possible influence of asymmetric deformation of the Fermi surface due to the SO interaction.

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R. Kadono, M. Hiraishi, M. Miyazaki, K. H. Satoh, S. Takeshita, S. Kuroiwa, S. Saura, J. Akimitsu. 2008-09-08. Magnetic response of noncentrosymmetric superconductor La2C3: Effect of double-gap and spin-orbit interaction. https://doi.org/10.1016/j.physb.2008.11.186

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