Effects of impurities with singlet-triplet configuration on multiband superconductors

Mikito Koga, Masashige Matsumoto, Hiroaki Kusunose

研究成果: Article査読

1 被引用数 (Scopus)


Roles of multipole degrees of freedom in multiband superconductors are investigated in a case of impurities whose low-lying states consist of singlet ground and triplet excited states, which is related to the experimental fact that the transition temperature Tc is increased by Pr substitution for La in LaOs4Sb12. The most important contribution to the Tc increase comes from the inelastic interband scattering of electrons coupled to quadrupole or octupole moments of impurities. It is found that a magnetic field modifies an effective pairing interaction and the scattering anisotropy appears in the field-orientation dependence of the upper critical field Hc2 in the vicinity of Tc, although a uniaxial anisotropic field is required for experimental detection. This would be proof that the Pr internal degrees of freedom are relevant to the stability of superconductivity in (La1-xPrx)Os4Sb 12.

ジャーナルJournal of the Physical Society of Japan
出版ステータスPublished - 6 2011

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