Normal state properties at a field-tuned quantum-critical point in the heavy-fermion superconductor CeRhIn₅

CeRhIn₅ is a prototypical heavy-fermion antiferromagnet where the localized 4f electron of Ce hybridizes weakly with ligand electrons. Applying pressure suppresses the antiferromagnetism and induces unconventional superconductivity when the same Ce 4f electrons become delocalized and participate in the formation of Cooper pairs. The emergent superconducting phase unavoidably hides the existence of quantum-critical point, preventing direct access to it. Measurements of the heat capacity and electrical resistivity under magnetic field and pressure reveal unusual normal state properties at a projected quantum-critical point (P 2): divergence in C / T and sublinear temperature dependence in the resistivity.