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arXiv · 1711.08133

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

Z. Ren·G. W. Scheerer·D. Aoki·K. Miyake·S. Watanabe·D. Jaccard
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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.

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Z. Ren, G. W. Scheerer, D. Aoki, K. Miyake, S. Watanabe, D. Jaccard. 2017-11-22. Coincidence of magnetic and valence quantum critical points in CeRhIn5 under pressure. https://doi.org/10.1103/physrevb.96.184524

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