Charge Order and the Origin of Giant Magnetocapacitance in LuFe2O4

Abstract

The nature of the charge order in the charge frustrated compound LuFe${}_2$O${}_4$ and its effect on magnetocapacitance were examined on the basis of first-principles electronic structure calculations and Monte Carlo simulations of electrostatic energy. Our work shows that two different types of charge order of almost equal stability (i.e., $\sqrt{3}\times \sqrt{3}$ and chain types) occur in the W-layers of LuFe${}_2$O${}_4$, and that the ground state of LuFe${}_2$O${}_4$ has a ferrielectric arrangement of the W-layers with $\sqrt{3}\times \sqrt{3}$ charge order. The giant magnetocapacitance effect of LuFe${}_2$O${}_4$ at room temperature is accounted for in terms of charge fluctuations arising from the interconversion between the two types of charge order, that becomes hindered by an applied magnetic field.

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