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

TL;DR

This study investigates the pressure-induced quantum critical points in CeRhIn5, revealing a close relationship between magnetic collapse and valence crossover, highlighting the role of Ce-4f electron delocalization in superconductivity.

Contribution

It provides detailed resistivity measurements under pressure, identifying a valence crossover line that coincides with magnetic collapse, linking electron delocalization to superconductivity.

Findings

Valence crossover line identified in p-T plane.

Collapse of magnetic order coincides with valence crossover.

Similar phase diagram to CeCu2Si2 in the valence crossover region.

Abstract

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