Anomalous hall effect in La0.7Sr0.3MnO3/SrTiO3 superlattices: Hopping transport and a probe of dimensionality
Journal
Physical Review Letters
Journal Volume
96
Journal Issue
7
Date Issued
2006
Author(s)
Wang, L.M.
Abstract
The anomalous Hall effect (AHE) in La0.7Sr0.3MnO3/SrTiO3 (LSMO/STO) superlattices was analyzed using theories of the Berry phase effect. The temperature-dependent anomalous Hall coefficient Rs is found to be expressed by -Rs = Rs0 exp[(T/T0)1.5], where Rs0 is a prefactor and T0 is in units of kelvin, and is explained by the carrier-hopping mechanism. In addition, a scaling analysis for the Hall resistivity as a function of magnetization supports the scenario of the Berry phase effects. Furthermore, a shifting extremum of Hall resistivity in LSMO/STO superlattices is observed and regarded as a probe of dimensionality in quasi-two-dimensional systems.
Type
journal article