Direct observation of the quantum critical point in heavy fermion CeRhSi$_3$

Details Direct observation of the quantum critical point in heavy fermion CeRhSi$_3$ Direct observation of the quantum critical point in heavy fermion CeRhSi$_3$

2012-02-05

arxiv.org/abs/1202.1010v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We report on muon spin rotation ($\mu$SR) studies of the noncentrosymmetric heavy fermion antiferromagnet CeRhSi$_3$. A drastic and monotonic suppression of the internal fields, at the lowest measured temperature, was observed upon increase of external pressure. Our data suggest that the ordered moments are gradually quenched with increasing pressure, in a manner different from the pressure dependence of the N\'eel temperature. At $\unit{23.6}{kbar}$ the ordered magnetic moments are fully suppressed via a second order phase transition and $T_{\rm{N}}$ is zero. Thus, we directly observed the quantum critical point at $\unit{23.6}{kbar}$ hidden inside the superconducting phase of CeRhSi$_3$.

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