Local electrical imaging of tetragonal domains and field-induced ferroelectric twin walls in conducting SrTiO3

H. J. Harsan Ma, S. Scharinger, S. W. Zeng, D. Kohlberger, M. Lange, A. Stöhr, X. Renshaw Wang, T. Venkatesan, R. Kleiner, J. F. Scott, J. M. D. Coey, D. Koelle, . Ariando

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Abstract

We demonstrate electrical mapping of tetragonal domains and electric field-induced twin walls in SrTiO3 as a function of temperature and gate bias utilizing the conducting LaAlO3/SrTiO3 interface and low-temperature scanning electron microscopy. Conducting twin walls appear below 105 K, and new twin patterns are observed after thermal cycling through the transition or on electric field gating. The nature of the twin walls is confirmed by calculating their intersection angles for different substrate orientations. Numerous walls formed when a large side- or back-gate voltage is applied are identified as field-induced ferroelectric twin walls in the paraelectric tetragonal matrix. The walls persist after switching off the electric field and on thermal cycling below 105 K. These observations point to a new type of ferroelectric functionality in SrTiO3, which could be exploited together with magnetism and superconductivity in a multifunctional context.
Original languageEnglish
Article number257601
Number of pages5
JournalPhysical Review Letters
Volume116
Issue number25
Early online date20 Jun 2016
DOIs
Publication statusPublished - 24 Jun 2016

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