Non-centrosymmetric Superconductivity and Antiferromagnetic Order: Microscopic Discussion of CePt<SUB>3</SUB>Si

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  • Yanase Youichi
    Department of Physics, University of Tokyo Theoretische Physik, ETH-Honggerberg
  • Sigrist Manfred
    Theoretische Physik, ETH-Honggerberg Department of Physics, Kyoto University

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  • Non-centrosymmetric superconductivity and antiferromagnetic order: microscopic discussion of CePt3Si

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The influence of antiferromagnetic order on the superconductivity in the non-centrosymmetric heavy fermion compound CePt3Si and related materials is discussed. Based on our RPA analysis for the extended Hubbard model two phases could be stabilized by a spin fluctuation induced pairing, with either dominantly p-wave or d-wave symmetry. The antiferromagnetic order plays an essential role for the low-energy physics, in particular, for the appearance of line nodes in the gap and the enhancement of spin susceptibility below Tc. Various properties and possible phase diagrams under pressure are analyzed. The present experimental situation suggests that the p-wave phase is most likely realized in CePt3Si.

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