Charge-stripe order in the electronic ferroelectric LuFe2O4

Details Charge-stripe order in the electronic ferroelectric LuFe2O4 Charge-stripe order in the electronic ferroelectric LuFe2O4

2007-02-26

arxiv.org/abs/cond-mat/0702588v1

Physics

Condensed Matter

Materials Science

15 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.247602

The structural features of the charge ordering states in LuFe2O4 are characterized by in-situ cooling TEM observations from 300K down to 20K. Two distinctive structural modulations, a major q1= (1/3, 1/3, 2) and a weak q2=q1/10 + (0, 0, 3/2), have been well determined at the temperature of 20K. Systematic analysis demonstrates that the charges at low temperatures are well crystallized in a charge stripe phase, in which the charge density wave behaviors in a non-sinusoidal fashion resulting in elemental electric dipoles for ferroelectricity. It is also noted that the charge ordering and ferroelectric domains often change markedly with lowering temperatures and yields a rich variety of structural phenomena.

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