Abstract
We examine the interplay between quantum charge fluctuations and magnetic ordering in multiferroic LuFe2O4 and show that this can couple spin and charge degrees of freedom in a LuFe2O4 bilayer below the Neel temperature TN. Our analysis supports the idea that the double exchange mechanism normally used in metallic systems can be applied to charge-ordered insulators. This causes ferrimagnetic spin order to reduce the transfer integrals between Fe2+ and Fe3+ in LuFe2O4, decreasing charge fluctuations and increasing the polarization in this system below TN. This work thus provides a more detailed understanding of the mechanism for spin-charge coupling in LuFe2O4.
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