MAGNETORESISTANCE IN Y(NI1-XCOX)(5) AROUND THE CRITICAL CONCENTRATIONFOR THE ONSET OF FERROMAGNETISM

Resistivity measurements with and without a magnetic field (magnetores istance) have been used to investigate the pseudobinary Y(Ni1-xCox)(5) system. The aim was to confirm the existence of spin fluctuations mai nly at the concentration where the long-range magnetic order appears ( x = 0.3) since from the temperature dependence of the susceptibility i t been claimed that YNi5 is a spin fluctuation system (Coldea et al. J . Magn. Magn. Mat. 157-158 (1996) 627). None of the obtained results i ndicate that spin fluctuations are significant for the properties, nei ther for YNi5 nor for the pseudobinaries around the onset of magnetism . (C) 1998 Elsevier Science B.V. All rights.