Influence of disorder on the transport properties of heavy-fermion systems
| Autor: | Thomas Pruschke, Claas Grenzebach, Gerd Czycholl, Frithjof B. Anders |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Kondo insulator FOS: Physical sciences 02 engineering and technology Function (mathematics) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Condensed Matter - Strongly Correlated Electrons Electrical resistivity and conductivity Seebeck coefficient 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Strongly correlated material 010306 general physics 0210 nano-technology Anderson impurity model Order of magnitude Sign (mathematics) |
| Zdroj: | Physical Review B. 77 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.77.115125 |
| Popis: | 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. 17 pages, 22 figures, published version |
| Databáze: | OpenAIRE |
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