Interface structure ofSrTiO3∕LaAlO3at elevated temperatures studiedin situby synchrotron x rays

Autor:	Alexander Brinkman, Mark Huijben, K.J.I. Driessen, Sybolt Harkema, H. Graafsma, Vedran Vonk, Paul Tinnemans
Rok vydání:	2007
Předmět:	Diffraction Materials science Condensed matter physics Jahn–Teller effect Electron Condensed Matter Physics Molecular physics Synchrotron Electronic Optical and Magnetic Materials law.invention Octahedron law Lattice (order) X-ray crystallography Principal axis theorem
Zdroj:	Physical Review B. 75
ISSN:	1550-235X 1098-0121
Popis:	The atomic interface structure between SrTiO3 and LaAlO3 was studied at elevated temperatures employing in situ surface x-ray diffraction. The results at 473 K indicate that the lattice distorts significantly in two ways. First, the interatomic distances between the cations across the interface become as large as 4.03(2) A. Second, the TiO6 octahedra at the interface contract their principal axis along the surface normal considerably and the Ti displaces off center. These distortions can be ascribed to the charge inbalance introduced by the change in atomic species across the interface and to a Jahn-Teller effect. The latter distortion suggests the presence of extra electrons at the interface, which is important for understanding the electronic properties of this system.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::196afae22bdf7fdf56add32233f72ac3 https://doi.org/10.1103/physrevb.75.235417 Zobrazit plný text záznamu