Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.32: Poster
Tuesday, March 27, 2012, 18:15–21:45, Poster B
X-ray spectroscopic investigation of YVO3 — •Olga Schuckmann1, Stefan Bartkowski1, Anna Buling1, Christine Derks1, Karsten Küpper2, Stephen Blundell3, Ewa Talik4, and Manfred Neumann1 — 1Fachbereich Physik, Universität Osnabrück, Germany — 2Abteilung Festkörperphysik, Universität Ulm, Germany — 3Clarendon Laboratory, University of Oxford, United Kingdom — 4University of Silesia, Institute of Physics, Katowice, Poland
Orthovanadate YVO3 is a particularly interesting material, due to multiple orbital-, spin ordering and structural phase transitions as a function of temperature. The dynamic of such phase transition plays a key role in optical rewritable data storages, due to the limitation of the switching rate by the phasechange rate.
Moreover YVO3 is a strongly correlated electron system, thus the interplay between the kinetic energy and Coulomb interaction manipulates the electronic and magnetic properties of matter. Due to the strong correlation between d electrons a variety of physical properties, such as Mott transition and so insulating phases, can occur.
By means of X-ray spectroscopic techniques XPS, XES and XAS, the electronic structure and microscopic formation of physical properties of YVO3, as the origin of the band gap, satellites and the valence states are investigated. As a first result we identified YVO3 as a real Mott-insulator with a nominal band gap of minimum 1.1 eV.