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On the Electrical Conductivity of the Periodic Anderson Model
Author(s) -
Elk K.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221050209
Subject(s) - condensed matter physics , conductivity , density of states , electrical resistivity and conductivity , anderson impurity model , kubo formula , electron , electronic band structure , valence (chemistry) , electron density , physics , materials science , quantum mechanics
The periodic Anderson model is used as a simple model describing intermediate valence compounds. In that model a strong electron—electron correlation is taken into account. The correlation term is decoupled using the alloy analogy approximation, which yields a two‐peak structure of the density of states of the f‐electrons. Then the electrical conductivity can be obtained using the Kubo‐Greenwood formula. By numerical methods the density of states and the temperature dependence of the conductivity are calculated. The density of states shows an interesting structure in the centre of the hybridized f‐band. For the conductivity σ an increase with increasing temperature is found. A remarkable pressure dependence of σ is not observed in the model used.