Origin of the Ising Ferrimagnetism and Spin-Charge Coupling in LuFe2O4

Abstract

The spin ordering and spin-charge coupling in LuFe2O4 were investigated on the basis of density functional calculations and Monte Carlo simulations. The 2:1 ferrimagnetism arises from the strong antiferromagnetic intra-sheet Fe3+-Fe3+ and Fe3+ -Fe2+ as well as some substantial antiferromagnetic Fe2+-Fe3+ inter-sheet spin exchange interactions. The giant magnetocapacitance at room temperature and the enhanced electric polarization at 240 K of LuFe2O4 are explained by the strong spin-charge coupling.

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• Ferroelectric and Magnetic Domains in LuFe2O4 Observed by Scanning Probe Microscopy
• Antiferromagnetic spin-1/2 chains in (NO)Cu(NO3)3: a microscopic study
• Electron-lattice coupling contributions to polarization switching in charge-order-induced ferroelectrics
• Quantum Dielectric Fluctuation in an Electronic Ferroelectricity studied by Variational Monte-Carlo Method
• Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering
• Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δ
• Probing the Interplay between Quantum Charge Fluctuations and Magnetic Ordering in LuFe2O4