منابع مشابه
The Verwey Transition in Magnetite
The historical development and theories explaining the Verwey transition in Magnetite are discussed. An overview of current experimental work is included. Also examined are multiple charge ordering theories and more sophisticated considerations of Jahn-Teller effects which attempt to explain this long-standing problem in strongly-correlated electron systems.
متن کاملRaman study of the Verwey transition in magnetite thin films
We have grown epitaxial thin films of magnetite on MgO and Al2O3 substrates with sharp and distinct signatures of the Verwey transition in resistivity and magnetization. We have used Raman scattering to separate the footprint of purely structural changes from the effect of additional charge and orbital order. Raman modes related to the structural phase transition occur first at temperatures abo...
متن کاملLong range charge ordering in magnetite below the Verwey transition.
The crystal structure of Fe(3)O(4) below the 122 K Verwey transition has been refined using high-resolution x-ray and neutron powder diffraction data. The refinements give direct evidence for charge ordering (CO) over four independent octahedral Fe sites, two with a charge of +2.4 and the other two of +2.6. CO schemes consistent with our model do not meet the widely accepted Anderson condition ...
متن کاملBrillouin scattering studies in Fe3O4 across the Verwey transition
Brillouin scattering studies have been carried out on high quality single crystals of Fe3O4 with [100] and [110] faces in the temperature range of 300 to 30 K. The room temperature spectrum shows a surface Rayleigh wave (SRW) mode at 8 GHz and a longitudinal acoustic (LA) mode at 60 GHz. The SRW mode frequency shows a minimum at the Verwey transition temperature TV of 123 K. The softening of th...
متن کاملExchange bias induced by the Fe3O4 Verwey transition
J. de la Venta,1,* M. Erekhinsky,1 Siming Wang,1,2 K. G. West,1 R. Morales,3,4 and Ivan K. Schuller1 1Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla, California 92093, USA 2Materials Science and Engineering Program, University of California San Diego, La Jolla, California 92093, USA 3Departamento de Quı́mica-Fı́sica, Universidad del Paı́s Va...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 2010
ISSN: 0148-0227
DOI: 10.1029/2009jb006813