Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-06-03
Phys. Rev. Lett. vol 94, 136601 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
Final version
Scientific paper
10.1103/PhysRevLett.94.136601
We solve the disordered Holstein model in three dimensions considering the phonon variables to be classical. After mapping out the phases of the `clean' strong coupling problem, we focus on the effect of disorder at strong electron-phonon (EP) coupling. The presence of even weak disorder (i) enormously enhances the resistivity (\rho) at T=0, simultaneously suppressing the density of states at the Fermi level, (ii) suppresses the temperature dependent increase of \rho, and (iii) leads to a regime with d\rho/dT <0. We locate the origin of these anomalies in the disorder induced tendency towards polaron formation, and the associated suppression in effective carrier density and mobility. These results, explicitly at `metallic' density, are of direct relevance to disordered EP materials like covalent semiconductors, the manganites, and to anomalous transport in the A-15 compounds.
Kumar Sanjeev
Majumdar Pinaki
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