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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.22: Poster
Dienstag, 26. Februar 2008, 14:00–18:00, Poster B
Unusual Property of Spin Dynamical Susceptibility and its Effect on Superconductivity in Non-centrosymmetric Systems — •Tetsuya Takimoto and Peter Thalmeier — max planck institute for chemical physics of solids, dresden
Recently, non-centrosymmetric superconductors like CePt3Si attract much attention. For centrosymmetric system, Hubbard model consisting of hopping term and on-site interaction term will be a minimal model. In addition to these terms, the model hamiltonian of non-centrosymmetric system involves Rashba-field term, by which inversion symmetry is broken. In order to study effect of the Rashba-field on relation between spin fluctuation and superconductivity, we calculate spin dynamical susceptibility in the system. It is shown that unlike centrosymmetric system, spin dynamical susceptibilities show unusual momentum dependences, which is induced by Rashba-field. In order to explain these unusual features, group theoretical consideration is carried out. We will discuss its effect on superconductivity.