Magnetic characteristics of lanthanide-copper compounds with CeCu6structure

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Abstract
The magnetic susceptibilities of RCu6 compounds (R = rare earth) have been measured over the temperature range 80–1200°K. The contributions to the magnetic susceptibility are the Curie—Weiss term, expressing the para-magnetism of the localized f-electrons and a temperature-independent term for which all the contributions have been estimated. The most important contribution to the temperature-independent term is given by an enhanced Pauli paramagnetism. An expression is proposed for calculating the enhancement factors of the Pauli paramagnetism. The anomalous behaviour of the SmCu6 compound results mainly from Van Vleck-type paramagnetism, and could adequately be calculated on the basis of free Sm3+ ions, as in the case of the compound SmAl3 (de Wijn, van Diepen and Buschow 1967).