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Infrared and Raman Studies of 1T-TiTe2. Lev Gasparov, Department of Chemistry and Physics, University of North Florida Magnetite (Fe3O4) is a naturally occurring mineral interesting for remarkably different fields of science. It is the first magnetic material known to mankind and it is the earliest compound known to manifest charge-ordering transition discovered by Verwey in 1939. At the same time magnetite is an integral part of many live objects such as magnetotactic bacteria. Furthermore, it was reported that magnetite occurs in human brains and it may play a role in pathogenesis of the neurodegenerative diseases such as Alzheimer. Magnetite (Fe3O4) is an example of the Correlated Electron Materials. These materials represent an intermediate case of the electronic structure of solids between those that have itinerant electrons and those with localized electrons. Even though magnetite has been extensively studied for more than sixty years the physics of this compound is not completely understood. In particular, one of the main puzzles of magnetite is the nature of the Verwey transition. In this project the PI used Raman scattering to study magnetite. Raman spectra of optimally doped magnetite (Fe3O4) single crystals reveal broad electronic background extending up to 900 wavenumbers (~110 meV). Redistribution of this background is observed when sample is cooled below the Verwey transition temperature (TV= 123K). Such redistribution may be assigned to an opening of the charge gap at about 350 wavenumbers (43 meV). The value of the gap is within the range of the photoemission data on freshly fractured magnetite sample. J. Appl. Phys. 101, 09G108-1 (2007)