Hopping transport in SrTiO3/Nd1–xTiO3/SrTiO3 heterostructures

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

doi:10.1103/physrevmaterials.3.065006

Hopping transport in SrTiO₃/Nd_1–xTiO₃/SrTiO₃ heterostructures

Journal Article · Thu Jun 27 00:00:00 EDT 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.3.065006· OSTI ID:1612521

Thoutam, Laxman Raju ^[1]; Yue, Jin ^[2]; Xu, Peng ^[2]; Jalan, Bharat ^[2]

Univ. of Minnesota-Twin Cities, Minneapolis, MN (United States); DOE/OSTI
Univ. of Minnesota-Twin Cities, Minneapolis, MN (United States)

Electronic transport near the insulator-metal transition is investigated in the molecular beam epitaxy-grown SrTiO₃/Nd_1–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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0016371

OSTI ID:: 1612521

Alternate ID(s):: OSTI ID: 1546422

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 3; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Hopping transport in SrTiO3/Nd1–xTiO3/SrTiO3 heterostructures

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Hopping transport in SrTiO₃/Nd_1–xTiO₃/SrTiO₃ heterostructures