Perturbation Theory of Spin-Triplet Superconductivity for Sr_2RuO_4 : Condensed Matter: Electronic Properties, etc.

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概要

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• We discuss the possibility of spin-triplet superconductivity within the third order perturbation theory with respect to on-site Coulomb repulsion U. Critical temperature T_c for spin-triplet pairing state is calculated in a single-band two-dimensional Hubbard model and relatively high T_c is obtained for moderately large U. The present situation considered here is particularly intended for the main branch γ in Sr_2RuO_4. According to the calculation, third order vertex correction terms, which are not direct contribution from spin fluctuation, are important, while the bare susceptibility χo(q) need not always have a prominent peak at q = 0 for the spin-triplet pairing state. The picture that strong ferromagnetic spin fluctuations mainly induce the spin-triplet superconductivity in Sr_2RuO_4 may not be appropriate, and such momentum dependence of renormalized effective interaction between quasi-particles as is not sufficiently taken into account in spin fluctuation mediated interaction is essential for realizing the spin-triplet pairing.

• 社団法人日本物理学会の論文
• 2000-11-15

著者

• Yamada Kosaku

  Department Of Mechanical Engineering Faculty Of Engineering Kagoshima University

• Nomura Takuji

  Department Of Physics Kyoto University

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