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

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

2008-07-22

arxiv.org/abs/0807.3527v2

Phys. Rev. Lett. 101, 227601 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

v2: added more details on representation analysis; edited for accessibility to general readership. PRL in print

Scientific paper

10.1103/PhysRevLett.101.227601

X-ray scattering by multiferroic LuFe2O4 is reported. Below 320 K, superstructure reflections indicate an incommensurate charge order with propagation close to (1/3,1/3,3/2). The corresponding charge configuration, also found by electronic structure calculations as most stable, contains polar Fe/O double-layers with antiferroelectric stacking. Diffuse scattering at 360 K, with (1/3,1/3,0) propagation, indicates ferroelectric short-range correlations between neighboring double-layers. The temperature dependence of the incommensuration indicates that charge order and magnetism are coupled.

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