Local Electrical Imaging of Tetragonal Domains and Field-Induced Ferroelectric Twin Walls in Conducting SrTiO3

被引：40

作者：

Ma, H. J. Harsan ^{[1
,2
]}

Scharinger, S. ^{[3
,4
]}

Zeng, S. W. ^{[1
,2
]}

Kohlberger, D. ^{[3
,4
]}

Lange, M. ^{[3
,4
]}

Stoehr, A. ^{[3
,4
]}

Wang, X. Renshaw ^{[1
,2
]}

Venkatesan, T. ^{[1
,2
,5
]}

Kleiner, R. ^{[3
,4
]}

Scott, J. F. ^{[6
,7
]}

Coey, J. M. D. ^{[1
,8
]}

Koelle, D. ^{[3
,4
]}

Ariando ^{[1
,2
]}

机构：

[1] Natl Univ Singapore, NUSNNI Nanocore, Singapore 117411, Singapore

[2] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[3] Univ Tubingen, Inst Phys, Morgenstelle 14, D-72076 Tubingen, Germany

[4] Univ Tubingen, Ctr Quantum Sci CQ LISA, Morgenstelle 14, D-72076 Tubingen, Germany

[5] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

[6] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland

[7] Univ St Andrews, Sch Phys, St Andrews KY16 9ST, Fife, Scotland

[8] Univ Dublin Trinity Coll, Dept Pure & Appl Phys, Dublin 2, Ireland

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 25期

基金：

新加坡国家研究基金会;

关键词：

PHASE-TRANSITION;

D O I：

10.1103/PhysRevLett.116.257601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5