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On the Nature of Charge Order and the Origin of Giant Magnetocapacitance in LuFe2O4 | | H. J. Xiang
; M.-H. Whangbo*
; | | Date: |
18 Jan 2007 | | Subject: | Materials Science; Strongly Correlated Electrons | | 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., $sqrt{3} imes sqrt{3}$ 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 $sqrt{3} imes sqrt{3}$ 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. | | Source: | arXiv, cond-mat/0701461 | | Services: | Forum | Review | PDF | Favorites | |
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