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

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.

6 pages, 6 figures, to appear in PRB

References in corpus (6)

• Signatures of valence fluctuations in CeCu2Si2 under high pressure
• The quantum critical point in CeRhIn_5: a resistivity study
• Roles of Critical Valence Fluctuations in Ce- and Yb-Based Heavy Fermion Metals
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• Adaptation of the Bridgman anvil cell to liquid pressure mediums
• Possibility of valence-fluctuation mediated superconductivity in Cd-doped CeIrIn${}_5$ probed by In-NQR

Cited by in corpus (1)

• Kondo breakdown transitions and phase-separation tendencies in valence-fluctuating heavy-fermion materials