ISSP - The institute for Solid State Physics

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[ISSP Colloquiums]
Charge Ordering Materials: The Good, the Bad, and the Ugly
Title : Charge Ordering Materials: The Good, the Bad, and the Ugly
Date :
Time :
2008/4/24(Thu)
1:40 PM - 3:00 PM 
Place : Lecture room, 2nd Floor, Transdisciplinary Sciences Building, Graduate School of Frontier Science
Lecturer : Prof. David Mandrus
Affiliation : Oak Ridge National Laboratory
Summary : Charge ordering phenomena are ubiquitous in correlated electron systems, but despite its conceptual simplicity charge ordering in real materials is poorly understood. In this talk I will first review
the concepts and history of charge ordering, beginning with Verwey and Wigner in the 1930s. I will then discuss some new charge ordering materials, Fe2OBO3 and LuFe2O4. Fe2OBO3 is an excellent model system, displaying nearly ideal ionic charge order. LuFe2O4, on the other hand, is a poor model system, but nevertheless displays rich physics, including the appearance of ferroelectricity as a result of charge ordering. These new materials will be compared with the prototypical material Fe3O4 (magnetite), which is still poorly understood despite nearly 70 years of study.
Contact : Zenji Hiroi (ext.63445)