Anomalous behavior of the upper-critical-field in heavy-fermion superconductor CeRhSi₃

We report the temperature dependence of the upper-critical-field B _c2(T) with the fields along the tetragonal c-axis of the pressure-induced heavy-fermion superconductor CeRhSi₃ under several pressures. A bend in the B_c2(T) curve emerges at a pressure at which the antiferromagnetic order disappears. Simultaneously, an anomaly in the electrical resistivity in the normal state appears above the magnetic.eld of the bend point. Moreover, the initial slope [-dB_c2(T)/dT] _Tc is abruptly enhanced above the pressure at which the bend emerges. The anomalous behavior of B_c2(T) is probably related to the antiferromagnetism and the anomaly in the normal state.