On the origin of unusual transport properties observed in densely packed polycrystalline CaAl_{2}

S. Sergeenkov; F. M. Araujo-Moreira

doi:10.1063/1.2364667

paper

On the origin of unusual transport properties observed in densely packed polycrystalline CaAl_{2}

arXiv:cond-mat/0701456 · doi:10.1063/1.2364667

Abstract

A possible origin of unusual temperature behavior of transport coefficients observed in densely packed polycrystalline CaAl_{2} compound [M. Ausloos et al., J. Appl. Phys. 96, 7338 (2004)] is discussed, including a power-like dependence of resistivity with $ρ \propto T^{- 3/4}$ and N-like form of the thermopower. All these features are found to be in good agreement with the Shklovskii-Efros localization scenario assuming polaron-mediated hopping processes controlled by the Debye energy.