Superconductivity of CeRhIn₅ under High Pressure

Abstract

The pressure dependence of transport properties in CeRhIn 5 was studied up to 8.5 GPa by using a diamond-anvil cell. The electrical resistivity does not follow the T 2 -dependecne of a Fermi liquid nature under any pressure. In this non-Fermi liquid state, superconductivity was observed in a wide pressure range of 1.5 GPa< P <7.6 GPa. The superconducting temperature T C has a double-maximum structure with a minimum at 5.2 GPa. A maximum of T C =2.2 K was observed at P =2.5 GPa, where the corresponding electrical resistivity just above T C has the maximum. The upper critical field H C2 and the magnetoresistances were also investigated under pressure.