Absence of quantum criticality and presence of superconducting fluctuation in pressure-induced heavy-fermion superconductor CeRhSi ₃

We report the pressure dependence of antiferromagnetism and superconductivity in the heavy-fermion CeRhSi ₃ on the magnetic field in the tetragonal basal plane. The anomaly of the resistivity at the antiferromagnetic transition changes in behavior with increasing pressure. This is caused by the monotonic reduction of the A coefficient in ρ(T) - ρ ₀ + AT with increasing pressure. The analysis of the pressure dependence of the resistivity strongly indicates that there is no enhancement of spin fluctuation in the vicinity of the pressure at which antiferromagnetism disappears. At the pressures where superconductivity occurs in the antiferromagnetic state, the ac susceptibility shows weak magnetic shielding with a large dissipation energy in the superconducting state. This probably indicates that the superconducting fluctuation is dominant under the magnetic order.