Helical scattering signatures of strain and electronic textures in YbFe2O4 from three-dimensional reciprocal space imaging

Details Helical scattering signatures of strain and electronic textures in YbFe2O4 from three-dimensional reciprocal space imaging Helical scattering signatures of strain and electronic textures in YbFe2O4 from three-dimensional reciprocal space imaging

2011-01-28

arxiv.org/abs/1101.5600v4

Phys. Rev. B 85, 014115 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.85.014115

The insulating ternary oxide YbFe$_2$O$_4$ displays an unusual frustration-driven incommensurate charge-ordering (CO) transition, linked to possible ferroelectricity. Based on high-resolution synchrotron data, we report a detailed structural model showing that the CO phase is an incommensurate charge-density wave and cannot be ferroelectric, since the electrical dipole moments are also incommensurately modulated. The change between continuous and "spotty" helices of scattering at the CO transition is attributed to three-dimensional fluctuations of the direction of the ordering wavevector.

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