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

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

doi:10.1063/1.4768932

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

Mesoscale and Nanoscale Physics 2015-06-12 v1

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

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Abstract

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.

Keywords

two-dimensional electron gas variable range hopping NdAlO3/SrTiO3 heterointerface strong localization magnetoresistance interface strain

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@article{arxiv.1302.1411,
  title  = {Evolution of variable range hopping in strongly localized two dimensional electron gas at NdAlO3/SrTiO3 (100) heterointerfaces},
  author = {A. Annadi and A. Putra and A. Srivastava and X. Wang and Z. Huang and Z. Q. Liu and T. Venkatesan and Ariando},
  journal= {arXiv preprint arXiv:1302.1411},
  year   = {2015}
}

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15 pages, 4 figures

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

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