Physics – Condensed Matter – Superconductivity
Scientific paper
2008-09-08
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
10.1016/j.physb.2008.11.186
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.
Akimitsu Jun
Hiraishi M.
Kadono Ryosuke
Kuroiwa S.
Miyazaki Makito
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