Abstract
Charge ordering (CO) phenomena are found in many correlated electron systems but in general are poorly understood. A classical example of CO is found in magnetite, Fe3O4, which undergoes a CO transition (the so-called Verwey transition) at 120 K. Magnetite is a poor model system for studying CO; however, despite nearly 70 years of study, there is still no generally accepted description of the transition. In recent years several new materials that display CO transitions have been discovered, including Fe2OBO3 and LuFe2O4. These new materials are proving to be far better model systems for studying CO than magnetite. In this talk the Landau theory of CO transitions will be reviewed, and the behavior of the elastic response of LuFe2O4 will be discussed in this context. [Work at ORNL supported by DOE BES Division of Materials Science and Engineering. Work at UT supported by NSF DMR-0506292.]
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