Effects of pressure and magnetic field on transport properties of Y1−xRxCo2alloys (R=Gd, Tb, Dy, Ho and Er)

Electrical resistivity ? and thermopower S of Y1?xRxCo2 (R=Gd, Tb, Dy, Ho and Er) Laves phase alloy systems were measured at temperatures from 1.5 K to 300 K in magnetic fields up to 15 T and under hydrostatic pressure up to 2 GPa. We show that there is a universal linear relation between the pressure and magnetic field derivatives of the resistivity, d?/dP and d?/dB, with gradient, determined by pressure derivative of the critical metamagnetic field of the cobalt 3d electron system. A similar scaling behavior was found for the thermopower dependencies on pressure and alloy composition.