TY - JOUR
T1 - Magnetic response of noncentrosymmetric superconductor La2 C3
T2 - Effect of double-gap and spin-orbit interaction
AU - Kadono, R.
AU - Hiraishi, M.
AU - Miyazaki, M.
AU - Satoh, K. H.
AU - Takeshita, S.
AU - Kuroiwa, S.
AU - Saura, S.
AU - Akimitsu, J.
N1 - Funding Information:
We would like to thank the staff of TRIUMF for their technical support during the μ SR experiment. We also thank S. Fujimoto for helpful discussion on the effect of noncentrosymmetry on the electronic property of sesquicarbides. This work was supported by the KEK-MSL Inter-University Program for Oversea Muon Facilities and a Grant-in-Aid for Scientific Research on Priority Areas by Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2009/4/15
Y1 - 2009/4/15
N2 - The presence of spin-orbit (SO) interaction in a noncentrosymmetric superconductor, La2 C3 (Tc ≃ 11 K) is demonstrated by muon spin rotation (μSR) in its normal state, where μSR 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 (σv) exhibits a field dependence that is characterized by a kink, where σv (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 σv, and also consistent with the possible influence of asymmetric deformation of the Fermi surface due to the SO interaction.
AB - The presence of spin-orbit (SO) interaction in a noncentrosymmetric superconductor, La2 C3 (Tc ≃ 11 K) is demonstrated by muon spin rotation (μSR) in its normal state, where μSR 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 (σv) exhibits a field dependence that is characterized by a kink, where σv (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 σv, and also consistent with the possible influence of asymmetric deformation of the Fermi surface due to the SO interaction.
KW - Quasiparticle excitation
KW - Spin-orbit interaction
KW - Superconductivity
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U2 - 10.1016/j.physb.2008.11.186
DO - 10.1016/j.physb.2008.11.186
M3 - Article
AN - SCOPUS:62949127876
SN - 0921-4526
VL - 404
SP - 737
EP - 739
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 5-7
ER -