Dynamic defect correlations dominate activated electronic transport in SrTiO3

Snijders, Paul C.; Sen, Cengiz; McConnell, Michael P.; Ma, Ying-Zhong; May, Andrew F.; Herklotz, Andreas; Wong, Anthony T.; Ward, Thomas Zac

doi:10.1038/srep30141

Title: Dynamic defect correlations dominate activated electronic transport in SrTiO₃

Journal Article · Fri Jul 22 00:00:00 EDT 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep30141· OSTI ID:1271865

Snijders, Paul C. ^[1]; Sen, Cengiz ^[2]; McConnell, Michael P. ^[3]; Ma, Ying-Zhong ^[4]; May, Andrew F. ^[4]; Herklotz, Andreas ^[4]; Wong, Anthony T. ^[4]; Ward, Thomas Zac ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Lamar University, Beaumont, TX (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Strontium titanate (SrTiO₃, STO) is a critically important material for the study of emergent electronic phases in complex oxides, as well as for the development of applications based on their heterostructures. Despite the large body of knowledge on STO, there are still many uncertainties regarding the role of defects in the properties of STO, including their influence on ferroelectricity in bulk STO and ferromagnetism in STO-based heterostructures. In this paper, we present a detailed analysis of the decay of persistent photoconductivity in STO single crystals with defect concentrations that are relatively low but significantly affect their electronic properties. The results show that photo-activated electron transport cannot be described by a superposition of the properties due to independent point defects as current models suggest but is, instead, governed by defect complexes that interact through dynamic correlations. In conclusion, these results emphasize the importance of defect correlations for activated electronic transport properties of semiconducting and insulating perovskite oxides.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1271865

Journal Information:: Scientific Reports, Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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