Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-11-12
Phys. Rev. B 77, 115125 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
17 pages, 22 figures, published version
Scientific paper
10.1103/PhysRevB.77.115125
The influence of substitutional disorder on the transport properties of heavy-fermion systems is investigated. We extend the dynamical mean-field theory treatment of the periodic Anderson model (PAM) to a coherent-potential approximation for disordered strongly correlated electron systems. Considering two distinct local environments of a binary alloy $A_c B_{1-c}$ with arbitrary concentration $c$, we explore two types of disorder: on the f site and on the ligand sites. We calculate the spectral functions and self-energies for the disordered PAM as well as the temperature dependence of the resistivity and the thermoelectric power. The characteristic concentration dependence as well as the order of magnitude of transport properties are reproduced for metallic heavy-fermion systems and Kondo insulators. In particular, sign changes of the Seebeck coefficient as function of temperature and concentration are observed.
Anders Frithjof B.
Czycholl Gerd
Grenzebach Claas
Pruschke Thomas
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