Hopping transport in SrTiO3 / N d1-xTiO3 / SrTiO3 heterostructures

Laxman Raju Thoutam, Jin Yue, Peng Xu, Bharat Jalan

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Abstract

Electronic transport near the insulator-metal transition is investigated in the molecular beam epitaxy-grown SrTiO3/Nd1-xTiO3/SrTiO3 heterostructures using temperature dependent magnetotransport measurements. It was found that Nd vacancies introduce localized electronic states resulting in variable range hopping transport at low temperatures. At a fixed Nd-vacancy concentration, a crossover from Mott to Efros-Shklovskii variable range hopping transport was observed with decreasing temperature. With increasing disorder, a sign reversal of magnetoresistance from positive to negative was observed revealing interplay between intra-state interaction and the energy dependence of the localization length. These findings highlight the important role of stoichiometry when exploring intrinsic effects using heterostructure and interfaces in addition to offering broad opportunities to tailor low temperature transport using nonstoichiometry defects.

Original languageEnglish (US)
Article number065006
JournalPhysical Review Materials
Volume3
Issue number6
DOIs
StatePublished - Jun 27 2019

Bibliographical note

Funding Information:
We thank B. Shklovskii, and Y. Ayino for valuable discussions. This work was primarily funded by the U.S. Department of Energy (DOE) through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC-0016371. J.Y. acknowledges partial support through the Young Investigator Program of the Air Force Office of Scientific Research (AFOSR) through Grant No. FA9550-16-1-0205. Parts of this work were carried out using the Dynacool instrument that is funded by the University of Minnesota National Science Foundation (NSF) MRSEC.

Funding Information:
We thank B. Shklovskii, and Y. Ayino for valuable discussions. This work was primarily funded by the U.S. Department of Energy (DOE) through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC-0016371. J.Y. acknowledges partial support through the Young Investigator Program of the Air Force Office of Scientific Research (AFOSR) through Grant No. FA9550-16-1-0205. Parts of this work were carried out using the Dynacool instrument that is funded by the University of Minnesota National Science Foundation (NSF) MRSEC.

Publisher Copyright:
© 2019 American Physical Society.

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