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We report on muon spin rotation studies of the noncentrosymmetric heavyfermion antiferromagnet CeRhSi$_3$. A drastic and monotonic suppression of theinternal fields, at the lowest measured temperature, was observed upon anincrease of external pressure. Our data suggest that the ordered moments aregradually quenched with increasing pressure, in a manner different from thepressure dependence of the N\'eel temperature. At $\unit{23.6}{kbar}$, theordered magnetic moments are fully suppressed via a second-order phasetransition, and $T_{\rm{N}}$ is zero. Thus, we directly observed the quantumcritical point at $\unit{23.6}{kbar}$ hidden inside the superconducting phaseof CeRhSi$_3$.

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