✦ LIBER ✦

Dilution effects on orbital order in strongly correlated electron systems

✍ Scribed by S. Ishihara; T. Tanaka; M. Matsumoto

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 253 KB
Volume: 838
Category: Article
ISSN: 0022-2860
DOI: 10.1016/j.molstruc.2006.12.057

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✦ Synopsis

Dilution effects in orbital ordered systems with strong electron correlation are studied theoretically. Vacancy-concentration x dependence of the orbital-ordering temperature T OO is calculated in the two-representative orbital models, i.e. the e g -orbital model in a three dimensional square lattice and the two-dimensional orbital compass model. Reduction of T OO as a function of x is stronger than that in dilute magnets and is not explained by the simple percolation theory. This phenomenon is attributed to the directional interaction between orbitals. It is shown that due to the quantum effects, the effective dimensionality in the system is increased and the orbital order becomes robust against dilution. The present calculation provides a new aspect of the dilute ordered state in strongly correlated electron systems.

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