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Effect of Strong Correlation on a Mixed Valence System

  • Kazuo Ueda
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 29)

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
$$ {\text{X = C}}_{\text{I}} {\text{X}}_{\text{I}} {\text{ + C}}_{\text{II}} {\text{X}}_{\text{II}}, $$
(1)
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.

Keywords

Present Theory Paramagnetic State Mixed Valence Spin Susceptibility Dynamical Susceptibility 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1981

Authors and Affiliations

  • Kazuo Ueda
    • 1
  1. 1.Department of Applied PhysicsUniversity of TokyoTokyo, 113Japan

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