Oxygen-Vacancy-Induced Orbital Reconstruction of Ti Ions at the Interface of LaAlO3/SrTiO3 Heterostructures: A Resonant Soft-X-Ray Scattering Study

Park, J.; Cho, B-G; Kim, K. D.; Koo, J.; Jang, H.; Ko, K-T; Park, J-H; Lee, K-B; Kim, J-Y; Lee, D. R.; Burns, C. A.; Seo, S. S. A.; Lee, H. N.

doi:10.1103/PhysRevLett.110.017401

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Oxygen-Vacancy-Induced Orbital Reconstruction of Ti Ions at the Interface of LaAlO3/SrTiO3 Heterostructures: A Resonant Soft-X-Ray Scattering Study

Park, J.;
Cho, B-G;
Kim, K. D.;
Koo, J.;
Jang, H.;
... Lee, D. R.;
외 7명

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초록

Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO3/SrTiO3) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t(2g) states of interface Ti ions. Polarization dependence of intensities indicates the energy of d(xy) states is lower by similar to 1 eV than two other t(2g) states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces. DOI: 10.1103/PhysRevLett.110.017401

키워드

ELECTRON-GAS; OXIDES; ABSORPTION; SUPERLATTICES; SHARP

제목: Oxygen-Vacancy-Induced Orbital Reconstruction of Ti Ions at the Interface of LaAlO3/SrTiO3 Heterostructures: A Resonant Soft-X-Ray Scattering Study

저자: Park, J.; Cho, B-G; Kim, K. D.; Koo, J.; Jang, H.; Ko, K-T; Park, J-H; Lee, K-B; Kim, J-Y; Lee, D. R.; Burns, C. A.; Seo, S. S. A.; Lee, H. N.

DOI: 10.1103/PhysRevLett.110.017401

발행일: 2013-01-03

유형: Article

저널명: Physical Review Letters

권: 110

호: 1

출판사: AMER PHYSICAL SOC

발행국가: 미국

ISSN: E 1079-7114
P 0031-9007