Random Spin-Orbit Coupling in Spin Triplet Superconductors: Stacking Faults in Sr2RuO4 and CePt3Si

被引:20
|
作者
Yanase, Youichi [1 ]
机构
[1] Niigata Univ, Dept Phys, Niigata 9502181, Japan
基金
日本学术振兴会;
关键词
spin triplet superconductor; spin-orbit coupling; stacking fault; CePt3Si; Sr2RuO4; UPPER-CRITICAL-FIELD; PT-195; KNIGHT-SHIFT; UNCONVENTIONAL SUPERCONDUCTIVITY; D-VECTOR; UPT3; PHASES; SYMMETRY; CRYSTALS; PARITY;
D O I
10.1143/JPSJ.79.084701
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The random spin-orbit coupling in multicomponent superconductors is investigated focusing on the non-centrosymmetric superconductor CePt3Si and the spin triplet superconductor Sr2RuO4. We find novel manifestations of the random spin-orbit coupling in the multicomponent superconductors with directional disorders, such as stacking faults. The presence of stacking faults is indicated for the disordered phase of CePt3Si and Sr2RuO4. It is shown that the d-vector of spin triplet pairing is locked to be d = k(y)(x) over cap - k(x)(y) over cap with the anisotropy Delta T-c/T-c0 similar to (alpha) over bar (2)/Tc0Wz, where (alpha) over bar, T-c0, and W-z are the mean square root of random spin-orbit coupling, the transition temperature in the clean limit, and the kinetic energy along the c-axis, respectively. This anisotropy is much larger (smaller) than that in the clean bulk Sr2RuO4 (CePt3Si). These results indicate that the helical pairing state d = k(y)(x) over bar - k(x)(y) over cap in the eutectic crystal of Sr2RuO4-Sr3Ru2O7 is stabilized in contrast to the chiral state d = (k(x) +/- ik(y))(z) over cap in the bulk Sr2RuO4. The unusual variation of T-c in CePt3Si is resolved by taking into account the weak pair-breaking effect arising from the uniform and random spin-orbit couplings. These superconductors provide a basis for discussing recent topics on Majorana fermions and non-Abelian statistics.
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页数:10
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