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Dielectric and magnetic phenomena in spin and charge frustrated system RFe2O4(R is a rare-earth metal ion) are studied. An electronic model for charge, spinand orbital degrees in a pair of triangular-lattice planes is derived. Weanalyze this model by utilizing the mean-field approximation and theMonte-Carlo simulation in a finite size cluster. A three fold-type chargeordered structure with charge imbalance between the planes is stabilized infinite temperatures. This polar charge order is reinforced by spin ordering ofFe ions. This novel magneto-dielectric phenomenon is caused by spin frustrationand charge-spin coupling in the exchange interaction. We show cross-correlationeffect in magnetic- and electric-field responses. Oxygen deficiency effect asan impurity effect in a frustrated charge-spin coupled system is also examined.

Magneto-Dielectric phenomena in charge and spin frustrated system of layered iron oxide