Electrical resistivity and magnetoresistance ofCeRu2Si2under pressure

The electrical resistivity and high-field magnetoresistance of the heavy-fermion compound ${\mathrm{CeRu}}_2$ ${\mathrm{Si}}_2$ have been measured as a function of pressure up to 10 kbar. From the depression of the $T^2$ resistivity term below ≊1 K, a rapid increase of the characteristic energy of the quasiparticle system is inferred, which can be represented by a large electronic Grüneisen coefficient Ω≃185, in excellent agreement with other experimental estimates. It is further observed that the critical field $H_M$ of the metamagneticlike transition increases at a similar rate, implying that this quantity is governed by the same parameter. The T dependence of ρ at fixed field suggests that the transition always occurs for the same value of the effective 4f density of states.