Behavior of the thermopower in amorphous materials at the metal-insulator transition

Details Behavior of the thermopower in amorphous materials at the metal-insulator transition Behavior of the thermopower in amorphous materials at the metal-insulator transition

2000-06-06

arxiv.org/abs/cond-mat/0006083v1

Phys. Rev. B, vol. 62 (2000), 16446-16452

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages, 10 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.62.16446

We study the thermal transport properties in three-dimensional disordered systems close to the metal-insulator transition within linear response. Using a suitable form for the energy-dependent conductivity $\sigma$, we show that the value of the dynamical scaling exponent for noninteracting disordered systems such as the Anderson model of localization can be reproduced. Furthermore, the values of the thermopower S have the right order of magnitude close to the transition as compared to the experimental results. A sign change in the thermoelectric power S - as is often observed in experiments - can also be modeled within the linear response formulation using modified experimental $\sigma$ data as input.

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