NMR study of heavy fermion superconductor with no inversion symmetry CePt3Si

We report Pt-195 and Si-29 NMR studies of an antiferromagnetic heavy fermion superconductor CePt3Si with no inversion symmetry in the crystal structure. The temperature dependence of spin-lattice relaxation rates (1/T-1) for Pt and Si nuclei measured between 2 and 300 K might be explained by the contributions from a low-lying crystalline-electric-field level and a quasiparticle due to a hybridization between the ground state and conduction electrons. Just below the superconducting transition temperature (T-c) no remarkable enhancement in 1/T-1 was observed within an experimental error. No significant decrease in Si-29 Knight shift was observed for parallel direction to the c axis below T-c. This indicates that spin triplet pairing is probably realized for the superconductivity. (C) 2006 American Institute of Physics.