1302.1411 (A. Annadi et al.)

Evolution of variable range hopping in strongly localized two
dimensional electron gas at NdAlO3/SrTiO3 (100) heterointerfaces    [PDF]

A. Annadi, A. Putra, A. Srivastava, X. Wang, Z. Huang, Z. Q. Liu, T. Venkatesan, Ariando

We report evolution of the two-dimensional electron gas behavior at the NdAlO3/SrTiO3 heterointerfaces with varying thicknesses of the NdAlO3 overlayer. The samples with a thicker NdAlO3 show strong localizations at low temperatures and the degree of localization is found to increase with the NdAlO3 thickness. The T -1/3 temperature dependence of the sheet resistance at low temperatures and the magnetoresistance study reveal that the conduction is governed by a two-dimensional variable range hopping mechanism in this strong localized regime. We attribute this thickness dependence of the transport properties of the NdAlO3/SrTiO3 interfaces to the interface strain induced by the overlayers.

View original: http://arxiv.org/abs/1302.1411