Superconducting Property in CePt3Si under Pressure

We have studied the superconducting property by measuring the electrical resistivity under the magnetic field and pressure for CePt 3 Si, which is the first antiferromagnetic heavy fermion superconductor without inversion symmetry in its tetragonal crystal structure. The upper critical field H c2 (0) is found to be approximately isotropic: H c2 (0) = 2.7 T for H ∥[100] and 3.2 T for H ∥[001]. The Néel temperature T N = 2.3 K and the zero resistivity superconducting transition temperature T sc ≃0.65 K decrease markedly with increasing pressure, suggesting that the present superconductivity is correlated to the antiferromagnetic state.