Logarithmic temperature dependence of Hall transport in granular metals

Yu Jie Zhang*, Zhi Qing Li, Juhn-Jong Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We have measured the Hall coefficient RH and the electrical conductivity σ of a series of ultrathin indium-tin-oxide films between 2 and 300 K. A robust RHlnT law is observed in a considerably wide temperature range of 2 and ∼120K. This lnT dependence is explained as originating from the electron-electron interaction effect in the presence of granularity as theoretically predicted. Furthermore, we observed a σlnT law from 3 K up to several tens K, which also arose from the Coulomb interaction effect in inhomogeneous systems. These results provide strong experimental support for the current theoretical concepts for charge transport in granular metals with intergrain tunneling conductivity gT1.

Original languageEnglish
Article number052202
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number5
DOIs
StatePublished - 12 Aug 2011

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