Abstract
59Co NMR and magnetic studies were performed on Ho(Co1−x Cu x )2 and Ho(Co1−x Al x )2 compounds.T C increases considerably with increasingx (the effect is much more pronounced in the case of the Al substitution) and the originally first order transition (HoCo2) changes to the second order transition. The sharp spin-reorientation transition found in HoCo2 at ⋟15 K considerably broadens (over an interval of ⋟30K). Also the NMR spectra become much broader and this fact together with the observed increasing magnetic hardness (being presumably due to a random anisotropy effects) point to pronounced local surrounding effects due to Cu or Al atoms appearing in the neighbourhood of Co atoms.
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