Non Metallic Transport in Molecular Solids versus Dimensionality

Details Non Metallic Transport in Molecular Solids versus Dimensionality Non Metallic Transport in Molecular Solids versus Dimensionality

2000-11-21

arxiv.org/abs/cond-mat/0011362v2

J.Phys.:Condensed Matter, Vol.13 (2001) 2437

Physics

Condensed Matter

Statistical Mechanics

Keywords: Path Integrals, Polarons, Anharmonicity PACS: 31.15.Kb, 63.20.Ry, 66.35.+a

Scientific paper

10.1088/0953-8984/13/11/302

Path integral techniques and Green functions formalism are applied to study the (time) temperature dependent scattering of a polaronic quasiparticle by a local anharmonic potential in a bath of diatomic molecules. The electrical resistivity has been computed in any molecular lattice dimensionality for different values of electron-phonon coupling and intermolecular forces. A broad resistivity peak with non metallic behavior at temperatures larger than $\simeq 100K$ is predicted by the model for sufficiently strong polaron-local potential coupling strengths. This peculiar behavior, ascribed to purely structural effects, is favoured in low dimensionality.

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