Electron correlation effects on magnetism in superconductors without inversion symmetry

Abstract We investigate magnetic properties of superconductors without inversion symmetry with particular emphasis on the role played by electron correlation effects. It is found that the strong electron correlation seriously affects the temperature dependence of the spin susceptibility which consists of the Pauli term and the van-Vleck-like term, of which the existence is due to parity violating spin - orbit interaction. The implication of the results for the recent NMR measurement of the heavy fermion superconductor CePt 3 Si , which indicates the unchanged Knight shift below T c for any directions of a magnetic field, is presented.