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We present accurate electrical resistivity measurements along the twoprinciple crystallographic axes of the pressure-induced heavy-fermionsuperconductor CeRhIn5 up to 5.63 GPa. For both directions, a valence crossoverline is identified in the p-T plane and the extrapolation of this line to zerotemperature coincides with the collapse of the magnetic ordering temperature.Furthermore, it is found that the p-T phase diagram of CeRhIn5 in the valencecrossover region is very similar to that of CeCu2Si2. These results point tothe essential role of Ce-4f electron delocalization in both destroying magneticorder and realizing superconductivity in CeRhIn5 under pressure.

Coincidence of magnetic and valence quantum critical points in CeRhIn5 under pressure