Abstract
In recent years a great deal of research has been done on some rare-erath metals and their compounds which show the mixed valence or valence fluctuating phenomena [1], Properties of this kind of materials are full of variety from material to material. Among them, in this paper we consider the case where one configuration is magnetic, e.g. \( {\text{Sm}}^3+\left(^6 {\text{H}}_{5 \mathord{\left/ {\vphantom {5 2}} \right. 2}}\right) \) and \( {\text{Ce}}^3+\left(^2 {\text{F}}_{5 \mathord{\left/ {\vphantom {5 2}} \right. 2}}\right) \) , and the other is nonmagnetic, e.g. \( {\text{Sm}}^2+\left(^7 {\text{F}}_0\right) \) and \( {\text{Ce}}^4+\left(^1{\text{S}}_0\right) \) . Magnetic property of this class of materials has a characteristic feature. At high temperatures susceptibility is expressed by the formula
where XI(XII) is the susceptibility expected for one valence state and CI(CII) is its fraction. In a word, high-temperature property is characterized by a local-moment-type behavior. On the other hand, at low temperatures the susceptibility tends to a constant and no magnetic order is observed.
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References
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© 1981 Springer-Verlag Berlin Heidelberg
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Ueda, K. (1981). Effect of Strong Correlation on a Mixed Valence System. In: Moriya, T. (eds) Electron Correlation and Magnetism in Narrow-Band Systems. Springer Series in Solid-State Sciences, vol 29. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81639-0_21
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DOI: https://doi.org/10.1007/978-3-642-81639-0_21
Publisher Name: Springer, Berlin, Heidelberg
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