Pressure effect on magnetism and superconductivity in [formula omitted

Abstract

Magnetism and superconductivity in the heavy-fermion superconductor CePt 3 Si have been studied under pressure. The antiferromagnetic and superconducting transition temperatures, T N and T sc , respectively, decrease by applying pressure. T N becomes zero around 0.6–0.7 GPa, while the pressure dependence of T sc exhibits a shoulder-like feature around 0.7 GPa, and superconductivity is found to persist in the pressure range up to about 1.5 GPa. A broad peak around 5 K in the temperature derivative of thermal expansion α ( T ) and electrical resistivity d ρ ( T ) / d T at ambient pressure begins to shift to higher temperatures above 0.7 GPa. These results suggest that a critical pressure exists around 0.6–0.7 GPa in CePt 3 Si .