Journal ArticleDOI
Self-consistent alloy treatment of the periodic anderson model: Susceptibility and specific heat of intermediate valence compounds
H. J. Leder,Gerd Czycholl +1 more
TLDR
In this article, the periodic Anderson model is replaced by the sum of two single-particle alloy Hamiltonians, the parameters of which have to be determined self-consistently.Abstract:
To describe the electronic properties of mixed valence compounds we study the periodic Anderson model within the frame of the alloy analog approximation. In this approach the model Hamiltonian is replaced by the sum of two single-particle alloy Hamiltonians the parameters of which have to be determined self-consistently. The alloy problem is solved within the coherent potential approximation. In contrast to other treatments of the periodic Anderson model this approximation scheme is exact in both trivially solvable limits of vanishing hybridization and Coulomb repulsion, respectively. For model parameters corresponding to a mixed valence situation only nonmagnetic solutions of the self-consistency equations exist. After discussing the limit of small hybridization analytically we numerically calculate the magnetic susceptibility and the electronic specific heat as a function of temperature for realistic values of the hybridization and Coulomb repulsion. The results are in very good qualitative agreement with experimental data.read more
Citations
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Journal ArticleDOI
Valence fluctuation phenomena
TL;DR: In this article, the authors review the experimental results observed in the subset of rare-earth systems for which the 4f ions form a lattice with identical valence on each site, and discuss key thermodynamic experiments, such as susceptibility and lattice constant, and spectroscopic experiments such as XPS and neutron scattering.
Journal ArticleDOI
Influence of disorder on the transport properties of heavy-fermion systems
TL;DR: In this paper, the influence of substitutional disorder on the transport properties of heavy-fermion systems is investigated, and the spectral functions and self-energies for the disordered PAM as well as the temperature dependence of the resistivity and the thermoelectric power are reproduced.
Book ChapterDOI
Results and problems in the theory of intermediate valence compounds
TL;DR: In this article, the properties of Intermediate Valence (VI) compounds are reviewed from a theoretical point of view, focusing on theoretical concepts which are developed and related to each other.
Journal ArticleDOI
Dynamical magnetic susceptibility of intermediate valence Tm systems
A.A. Aligia,B. Alascio +1 more
TL;DR: In this article, the inelastic part of the magnetic neutron scattering cros section of a periodic model for valence fluctuations between two magnetic configurations is calculated using the coherent potential approximation.
Journal ArticleDOI
Theory of the electronic properties of mixed valent compounds
TL;DR: In this article, a selfconsistent Green function theory of the Anderson lattice Hamiltonian is presented, which includes spin and charge fluctuations beyond mean field and are similar to previous approximations made for the impurity problem by Theumann (1969).
References
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Journal ArticleDOI
Localized Magnetic States in Metals
TL;DR: In this article, the conditions necessary in metals for the presence or absence of localized moments on solute ions containing inner shell electrons are analyzed, and a self-consistent Hartree-Fock treatment is applied to show that there is a sharp transition between the magnetic state and the nonmagnetic state, depending on the density of states of free electrons, the $s\ensuremath{-}d$ admixture matrix elements, and the Coulomb correlation integral in the $d$ shell.
Journal ArticleDOI
Single-Site Approximations in the Electronic Theory of Simple Binary Alloys
TL;DR: In this paper, a single-band model Hamiltonian is used to describe the electronic structure of a three-dimensional disordered binary alloy, and several common theories based on the single-site approximation in a multiple-scattering description are compared with exact results for this Hamiltonian.
Journal ArticleDOI
Magnetic susceptibility of mixed-valence rare-earth compounds
Chandra Varma,Y. Yafet +1 more
TL;DR: In this paper, the Anderson model was applied to rare earth compounds and the effect of temperature-independent magnetic susceptibility at low temperatures in their mixed valence phase was examined for an isolated impurity.
Journal ArticleDOI
Intermediate valence-a view of the theoretical situation
J H Jefferson,K W H Stevens +1 more
TL;DR: The intermediate valence (IV) phenomenon has recently received a good deal of experimental and theoretical attention, but in spite of all the effort the phenomenon is not well understood, particularly the low temperature observations as discussed by the authors.
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Theory of mixed valence: Metals or small gap insulators (invited)
Richard M. Martin,J. W. Allen +1 more