Magnetization and thermal expansion measurements have been performed on the series of pseudobinary cubic Laves phase compounds Ho(Co_1-xCu_x)₂ for x=0, 0.05, 0.10, 0.20 and 0.30. The magnetization and thermal expansion data show discontinuities at the ferromagnetic transition temperature, T_c, for x-values between 0 and 0.10, indicating first-order transitions for these compounds. In the remaining compounds a second-order transition is observed at T_c. This change is explained by a reduction of the susceptibility of the Co, Cu sublattice at increasing x-values. The T_c-values for the series Ho(Co, Cu)₂ are compared with those for other RE(Co, Cu)₂ compounds with RE=Gd, Tb and Dy. © 1986.

Hien T.D., Duc N.H., Franse J.J.M.

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Từ khóa : MAGNETIC MATERIALS - Ferromagnetism; MAGNETIC PROPERTIES; MAGNETIZATION; LAVES PHASE COMPOUNDS; THERMAL EXPANSION; RARE EARTH COMPOUNDS