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Unconventional crystal-field splitting in noncentrosymmetric BaTiO3 thin films

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dc.contributor.authorYang Song-
dc.contributor.authorLiu, XR-
dc.contributor.authorWen, FD-
dc.contributor.authorKareev, M-
dc.contributor.authorZhang, RY-
dc.contributor.authorPei, YJ-
dc.contributor.authorBi, JC-
dc.contributor.authorShafer, P-
dc.contributor.authorN'Diaye, AT-
dc.contributor.authorArenholz, E-
dc.contributor.authorSe Young Park-
dc.contributor.authorCao, YW-
dc.contributor.authorChakhalian, J-
dc.date.available2020-07-06T06:44:03Z-
dc.date.created2020-04-20-
dc.date.issued2020-02-
dc.identifier.issn2475-9953-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/7181-
dc.description.abstractUnderstanding the crystal-field splitting and orbital polarization in noncentrosymmetric systems such as ferroelectric materials is fundamentally important. In this study, taking BaTiO3 as a representative material, we investigate titanium crystal-field splitting and orbital polarization in noncentrosymmetric TiO6 octahedra with resonant x-ray linear dichroism at the Ti L-2,L-3 edge. The high-quality BaTiO3 thin films were deposited on DyScO3 (110) single crystal substrates in a layer-by-layer way by pulsed laser deposition. The reflection high-energy electron diffraction and element specific x-ray absorption spectroscopy were performed to characterize the structural and electronic properties of the films. In sharp contrast to conventional crystal-field splitting and orbital configuration (d(xz)/d(yz) < d(xy) < d(3z2-r2) < d(x2-y2) or d(xy) < d(xz)/d(yz) < d(x2-y2) < d(3z2-r2)) expected from compressive or tensile epitaxial strain, respectively, it is revealed that d(xz), d(yz), and d(xy) orbitals are nearly degenerate, whereas d(3z2-r2) and d(x2-y2) orbitals are split with an energy gap similar to 100 meV in the epitaxial BaTiO3 films. We find that the unexpected degenerate orbitals d(xz)/d(yz)/d(xy) result from the competition between the orbital splitting induced by epitaxial strain and that induced by polar distortions of BaTiO3 films. Our results provide a route to manipulate orbital degree of freedom by switching electric polarization in ferroelectric materials. ©2020 American Physical Society-
dc.description.uri1-
dc.language영어-
dc.publisherAMER PHYSICAL SOC-
dc.titleUnconventional crystal-field splitting in noncentrosymmetric BaTiO3 thin films-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000515722500005-
dc.identifier.scopusid2-s2.0-85082727842-
dc.identifier.rimsid71774-
dc.contributor.affiliatedAuthorSe Young Park-
dc.identifier.doi10.1103/PhysRevMaterials.4.024413-
dc.identifier.bibliographicCitationPHYSICAL REVIEW MATERIALS, v.4, no.2, pp.024413-
dc.citation.titlePHYSICAL REVIEW MATERIALS-
dc.citation.volume4-
dc.citation.number2-
dc.citation.startPage024413-
dc.description.journalClass1-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.subject.keywordPlusPHASE-TRANSITION-
dc.subject.keywordPlusFERROELECTRICITY-
dc.subject.keywordPlusPOLARIZATION-
dc.subject.keywordPlusORIGIN-
dc.subject.keywordPlusENHANCEMENT-
dc.subject.keywordPlusDIAGRAM-
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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