Title:	Spectroscopic study of transition metal compounds
Authors:	Demeter, Mihaela Carmen
Thesis advisor:	apl. Prof. Dr. Manfred Neumann
Thesis referee:	Prof. Dr. Ortwin F. Schirmer
Abstract:	In the last few years a renewed interest has reappeared in materials that were highly investigated in the 50s-70s, like manganese perovskites, spinel chalcogenides and vanadium oxides. The first two classes of materials are nowadays intensively studied due to the colossal magnetoresistance effect, which is the magnetoresistance associated with a ferromagnetic-paramagnetic transition. Vanadium oxides are known to form many compounds and most of them undergo metal-to-insulator phase transitions, with a high increase in the electrical conductivity (MIT). Many technological applications derive from the variation of the physical properties around the phase transition temperature. Although many efforts have been done in order to understand their electronic structures and to elucidate the MIT mechanisms, the vanadium oxides are still matter of debate in science.The present study has been performed in order to understand the electronic structure of these very intriguing materials. The role of different dopants that induce strong changes in the electronic and magnetic properties has been investigated making use of two spectroscopic techniques, namely X-ray photoelectron and X-ray emission spectroscopy.
URL:	https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2001051714
Subject Keywords:	electronic structure; Mn-perovskites; Cr-chalcogenide spinels; Colossal magnetoresistance; vanadium oxides; XPS; XES
Issue Date:	17-May-2001
Submission date:	17-May-2001
Type of publication:	Dissertation oder Habilitation [doctoralThesis]
Appears in Collections:	FB06 - E-Dissertationen

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