Lee, Joohwi Choi, Jong Kwon Moon, Seon Young Park, Jaehong Kim, Jin-Sang Hwang, Cheol Seong Baek, Seung-Hyub Choi, Jung-Hae Chang, Hye Jung 2024-01-20T07:34:11Z 2024-01-20T07:34:11Z 2021-09-04 2015-02-16 0003-6951 https://pubs.kist.re.kr/handle/201004/125760 We report the crystal symmetry-dependency of the interfacial reconstruction to relieve the polar discontinuity at the complex oxide heterointerfaces. We chose LaAlO3/SrTiO3 and LaAlO3/CaTiO3 interfaces as model systems, where the neutral TiO2 and the positive LaO+ layers form the polar discontinuity at the interface with TiO2-terminated (001) cubic SrTiO3 and orthorhombic CaTiO3. Using scanning transmission electron microscopy, we observed that the interlayer distance abnormally increased at the interface. We performed the first-principles calculations to understand the detailed atomic displacement at the interfaces having no oxygen vacancy and intermixing. Our results show that cations were reconstructed in different ways depending on the crystal symmetry through the octahedral tilts and atomic displacements to compensate the polar discontinuity at the interfaces. Our results imply that the interfacial reconstructions have to be considered along with the ionic compensation (intermixing) and electronic compensation (two dimensional electron gas) to fully understand the interfacial phenomena. (C) 2015 AIP Publishing LLC. English AMER INST PHYSICS SRTIO3/LAALO3 INTERFACES MAGNETIC-PROPERTIES EPITAXIAL STRAIN ELECTRIC-FIELDS THIN-FILMS SURFACE SRTIO3 SRRUO3 GAS Symmetry-dependent interfacial reconstruction to compensate polar discontinuity at perovskite oxide interfaces (LaAlO3/SrTiO3 and LaAlO3/CaTiO3) Article 10.1063/1.4913242 1 APPLIED PHYSICS LETTERS, v.106, no.7 APPLIED PHYSICS LETTERS 106 7 scie scopus 000350227300010 2-s2.0-84923303069 Physics, Applied Physics Article SRTIO3/LAALO3 INTERFACES MAGNETIC-PROPERTIES EPITAXIAL STRAIN ELECTRIC-FIELDS THIN-FILMS SURFACE SRTIO3 SRRUO3 GAS perovskite interface LaAlO3/SrTiO3 LaAlO3/CaTiO3