Abstract
We report on ac calorimetry of CeRhIn 5 at low temperature under high pressure and high magnetic field. In zero field the antiferromagnetic order vanishes near p c \star = 2 GPa presumably due to a first order transition. The application of a magnetic field H ∥( a , b ) plane above p c \star induces a second transition, which suggests the coexistence of long range antiferromagnetic order and gapped superconducting state. The field-induced state vanishes close to the expected quantum critical point in absence of superconductivity. Resistivity measurements above the critical pressure p c indicate the unusual metallic state in the normal phase. A schematic field-pressure phase diagram at low temperature is presented.
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