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Oh, Yoon Seok
Laboratory for Strong Correlation in Quantum Materials
Research Interests
  • Multiferroic
  • Ferroelectric
  • Quantum Magnetism

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Experimental demonstration of hybrid improper ferroelectricity and the presence of abundant charged walls in (Ca,Sr)3Ti2O7 crystals

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dc.contributor.author Oh, Yoon Seok ko
dc.contributor.author Luo, Xuan ko
dc.contributor.author Huang, Fei-Ting ko
dc.contributor.author Wang, Yazhong ko
dc.contributor.author Cheong, Sang-Wook ko
dc.date.available 2015-04-13T00:22:38Z -
dc.date.created 2015-04-10 ko
dc.date.issued 2015-04 ko
dc.identifier.citation NATURE MATERIALS, v.14, no.4, pp.407 - 413 ko
dc.identifier.issn 1476-1122 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/11263 -
dc.description.abstract On the basis of successful first-principles predictions of new functional ferroelectric materials, a number of new ferroelectrics have been experimentally discovered. Using trilinear coupling of two types of octahedron rotation, hybrid improper ferroelectricity has been theoretically predicted in ordered perovskites and the Ruddlesden-Popper compounds (Ca3Ti2O7, Ca3Mn2O7 and (Ca/Sr/Ba)3(Sn/Zr/Ge)2O7). However, the ferroelectricity of these compounds has never been experimentally confirmed and even their polar nature has been under debate. Here we provide the first experimental demonstration of room-temperature switchable polarization in bulk crystals of Ca3Ti2O7, as well as Sr-doped Ca3Ti2O7. Furthermore, (Ca,Sr)3Ti2O7 is found to exhibit an intriguing ferroelectric domain structure resulting from orthorhombic twins and (switchable) planar polarization. The planar domain structure accompanies abundant charged domain walls with conducting head-to-head and insulating tail-to-tail configurations, which exhibit a conduction difference of two orders of magnitude. These discoveries provide new research opportunities, not only for new stable ferroelectrics of Ruddlesden-Popper compounds, but also for meandering conducting domain walls formed by planar polarization. © 2015 Macmillan Publishers Limited. All rights reserved ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher NATURE PUBLISHING GROUP ko
dc.title Experimental demonstration of hybrid improper ferroelectricity and the presence of abundant charged walls in (Ca,Sr)3Ti2O7 crystals ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84925385371 ko
dc.identifier.wosid 000351757800015 ko
dc.type.rims ART ko
dc.description.wostc 13 *
dc.description.scopustc 6 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1038/nmat4168 ko
dc.identifier.url http://www.nature.com/nmat/journal/v14/n4/full/nmat4168.html ko
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