Charge order, dynamics, and magneto-structural transition in multiferroic LuFe${}_2$O${}_4$

Abstract

We investigated the series of temperature and field-driven transitions in LuFe${}_2$O${}_4$ by optical and Mössbauer spectroscopies, magnetization, and x-ray scattering in order to understand the interplay between charge, structure, and magnetism in this multiferroic material. We demonstrate that charge fluctuation has an onset well below the charge ordering transition, supporting the "order by fluctuation" mechanism for the development of charge order superstructure. Bragg splitting and large magneto optical contrast suggest a low temperature monoclinic distortion that can be driven by both temperature and magnetic field.

4 pages, 3 figures, PRL in print

References in corpus (2)

• Charge order in LuFe2O4: antiferroelectric ground state and coupling to magnetism
• Incommensurate Charge Order Phase in Fe2OBO3 due to Geometrical Frustration

Cited by in corpus (1)

• Charge order in LuFe2O4: antiferroelectric ground state and coupling to magnetism