The magnetization, a.c. susceptibility, resistivity and magnetoresistance have been measured for the invariable-unit-cell-parameter Ho(Co_1-xSi_x)₂ compounds. The Si substitution for Co in HoCo₂ yields a dramatic initial increase of T_C, whereas the 3d magnetic moment is reduced. These findings may be attributed to the strong involvement of Si p states in the hierarchy of exchange interactions. The magnetic phase transition at T_C is of first order for the compounds with x < 0.075. For these compounds, the coexistence of metamagnetism and the quenching of spin fluctuations at T > T_C are provided.

Duc N.H., Oanh T.K.

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Từ khóa : Electric conductivity measurement; Electric properties; Electrons; Magnetic moments; Magnetic permeability measurement; Magnetic properties; Magnetism; Magnetization; Magnetoresistance; Metamagnetism; Phase transitions; Temperature; Curie temperature; Exchange interactions; Spin fluctuations; Holmium compounds