An x-ray resonant diffraction study of multiferroic DyMn2O5

Details An x-ray resonant diffraction study of multiferroic DyMn2O5 An x-ray resonant diffraction study of multiferroic DyMn2O5

2007-11-12

arxiv.org/abs/0711.1745v1

Phys. Rev. B 77, 104415 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 8 figures

Scientific paper

10.1103/PhysRevB.77.104415

X-ray resonant scattering has been used to measure the magnetic order of the Dy ions below 40K in multiferroic DyMn$_{2}$O$_{5}$. The magnetic order has a complex behaviour. There are several different ordering wavevectors, both incommensurate and commensurate, as the temperature is varied. In addition a non-magnetic signal at twice the wavevector of one of the commensurate signals is observed, the maximum intensity of which occurs at the same temperature as a local maximum in the ferroelectric polarisation. Some of the results, which bear resemblence to the behaviour of other members of the RMn$_{2}$O$_{5}$ family of multiferroic materials, may be explained by a theory based on so-called acentric spin-density waves.

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