Chandran, L. ; Krishnamurthy, H. R. ; Ramakrishnan, T. V. (1992) Pressure-induced valence changes in mixed-valent systems Journal of Physics: Condensed Matter, 4 (34). pp. 7067-7094. ISSN 0953-8984
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Official URL: http://iopscience.iop.org/0953-8984/4/34/007
Related URL: http://dx.doi.org/10.1088/0953-8984/4/34/007
Abstract
Mixed-valent systems based on Ce, Sm, Eu and Yb exhibit a wide range of behaviour with respect to valence changes under the application of pressure. The authors present a semi-phenomenological model for this behaviour based on competition effects between the usual elastic energy cost and the magnetic energy gain due to valence fluctuations. For the latter they use a mean-field Anderson lattice description and incorporate the effects of pressure by introducing a volume dependence to the Anderson model parameters in f and Delta . In contrast to existing models such as the Kondo Volume Collapse theory of Allen and Martin (1982), which describes magnetic to non-magnetic transitions without sizable valence change (e.g. gamma -Ce to alpha -Ce), the Anderson lattice model developed here describes systems with both small and large valence changes: the transition can be continuous (e.g. EuPd2Si2) or discontinuous (EuPd2Si2 alloyed with Au).
Item Type: | Article |
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Source: | Copyright of this article belongs to Institute of Physics Publishing. |
ID Code: | 17638 |
Deposited On: | 16 Nov 2010 12:56 |
Last Modified: | 06 Jun 2011 05:54 |
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