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When subjected to pressure, the prototypical heavy‐fermion antiferromagnet CeRhIn 5  becomes superconducting, forming a broad dome of superconductivity (SC) centred around 2.35 GPa (= P 2) 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  ≤  P 2 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 5  under magnetic field at  P 2, 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.

Field‐induced quantum critical point in the pressure‐induced superconductor CeRhIn 5