Field-induced quantum critical point in the pressure-induced superconductor CeRhIn5

When subjected to pressure, the prototypical heavy-fermion antiferromagnet CeRhIn s becomes superconducting, forming a broad dome of superconductivity (SC) centred around 2.35 GPa (=P2) with maximal T c of 2.3 K. Above the superconducting dome, the normal state shows strange metallic behaviours, including a divergence in the specific heat and a sub-T-linear electrical resistivity. The discovery of a field-induced magnetic phase that coexists with SC for a range of pressures P ≤ P2 has been interpreted as evidence for a quantum phase transition, which could explain the non-Fermi-liquid behaviour observed in the normal state. Here we report electrical resistivity measurements of CeRhIn s under magnetic field at P2, where the resistivity is sub-T-linear for temperatures above T c (or T FL ) and a T 2 -coefficient A found below T FL diverges as H c2 is approached. These results are similar to the field-induced quantum critical compound CeCoIn 5 and confirm the presence of a quantum critical point in the pressure-induced superconductor CeRhIn 5 . Temperature-field phase diagram of CeRhIn 5 at 2.35 GPa.