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

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arxiv 0809.1274 v1 pith:QZOJT4BB submitted 2008-09-08 cond-mat.supr-con cond-mat.other

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 This is my paper
classification cond-mat.supr-con cond-mat.other
keywords interactionsigmadependencefieldla2c3muonmusrnoncentrosymmetric
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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