Abstract
Resistivity measurements with and without a magnetic field (magnetoresistance) have been used to investigate the pseudobinary Y(Ni 1− x Co x ) 5 system. The aim was to confirm the existence of spin fluctuations mainly at the concentration where the long-range magnetic order appears ( x=0.3) since from the temperature dependence of the susceptibility it has been claimed that YNi 5 is a spin fluctuation system (Coldea et al., J. Magn. Magn. Mat. 157–158 (1996) 627). None of the obtained results indicate that spin fluctuations are significant for the properties, neither for YNi 5 nor for the pseudobinaries around the onset of magnetism.
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