FisMat2017 - Submission - View

Abstract's title: On Mooij correlations in disordered metals
Submitting author: Sergio Ciuchi
Affiliation: University of L'Aquila / Istituto Sistemi Complessi CNR
Affiliation Address: Department of Physical and Chemical Sciences, University of L’Aquila, Via Vetoio, L’Aquila, Italy I-67100 Consiglio Nazionale delle Ricerche (CNR-ISC) Via dei Taurini, Rome, Italy I-00185
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Simone Fratini (CNRS Grenoble France), Domenico Di Sante (University of Wurzburg, Germany) Vladimir Dobrosavljevic' (Florida State University USA)

Strongly disordered metals exhibit marked deviations from conventional charge transport, most notably a breakdown of Matthiessen’s rule and anomalously large residual resistivities. This is accompanied by suppressed temperature coefficients of the resistivity (TCR), that decrease and can even become negative upon increasing lattice randomness, a phenomenon first noticed by Mooij and that has eluded a proper microscopic explanation up to now. Here we show that all these observations, as well as their relationship to Mott’s minimum metallic conductivity, can be consistently understood from the local interplay between disorder and electron-phonon interactions: favored by lattice randomness, even a moderate electron-phonon coupling can cause a significant renormalization of the electronic spectrum already far from the metal-insulator transition, triggering a crossover from a scattering-dominated transport to a pseudo-gap regime where the TCR changes sign. Contrary to the common belief, the universal changes of TCR observed in disordered metals are not governed by the critical behavior of the Anderson transition.