Dresden 2003 – wissenschaftliches Programm

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M: Metallphysik

M 41: Postersitzung

M 41.29: Poster

Donnerstag, 27. März 2003, 14:30–16:30, HSZ

Close analytical expressions for the transport coefficients of icosahedral quasicrystals — •Carlos Landauro and Heinrich Solbrig — Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany

In the present work we investigate, from an analytical point of view, the electronic transport properties of approximants and quasicrystals. The spectral resistivity, required to obtain the transport coefficients, is modeled by two Lorenz functions in agreement with realistic ab-initio calculations (LMTO-ASA, Kubo-Greenwood formula) for low order approximants. These analytical expressions are well compared with both, exact numerical calculations and experiments. Thus, the temperature-dependent conductivity, thermopower, electronic thermal conductivity, and Lorenz number of approximants and quasicrystals can be consistently explained. Finally, the validity of the Wiedemann-Franz law is also discussed.