Abstract
Electrical resistivity of Y 1 - x Gd x Co 2 alloy system has been measured at temperatures from 2 to 300 K in magnetic field up to 15 T and under pressure up to 10 GPa. The compounds with the composition near to phase boundary between paramagnetic and ferromagnetic ground state ( x c ≈ 0.12 ) show strong enhancement of electrical resistivity at low temperatures. Large positive magnetoresistance was observed in ferromagnetic alloys in composition range 0.15 < x < 0.3 . The anomalous magnetoresistance as well as the composition dependence of the low-temperature resistivity were explained by an interplay of metamagnetic instability of Co 3d itinerant electrons and structural disorder within rare-earth sublattice. The pressure effect on electrical resistivity for Y 1 - x Gd x Co 2 at low temperatures is in agreement with the variation of magnetoresistance with the composition.
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