Acta Physica Polonica B

Vol. 34, No. 22, February 2003, page 1177

Magnetic Properties and Eu Valence in EuCu{}2(Si{}xGe{}1-x){}2

S. Fukuda, Y. Nakanuma, A. Mitsuda, Y. Isikawa, J. Sakurai

We performed measurements of magnetic susceptibility (\chi ) and LIII-edge X-ray absorption spectroscopy (XAS) in EuCu2(SixGe1-x)2. For 0.70 \leq x \leq 0.80, with decreasing temperature, the \chi deviates from Curie--Weiss (CW) law with a Eu2+ state and exhibits almost temperature-independent behaviour at lower temperatures. The behaviour, which is roughly similar to that accompanied by the valence transition in EuNi2(Si1-xGex)2, cannot be interpreted only in terms of the valence change. The hybridization between 4f electrons and a conduction band should also be taken into consideration.

PACS numbers: 71.27.+a, 75.20.Hr, 75.30.Mb

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