Non-resonant and resonant x-ray scattering studies on multiferroic TbMn2O5.


Comprehensive x-ray scattering studies, including resonant scattering at Mn L, Tb L, and M edges, were performed on single crystals of TbMn2O5 for crystallographic data to elucidate the nature of its commensurate and incommensurate phases. The scattering results provide direct evidence of symmetry lowering to the ferroelectric phase driven by magnetically induced lattice modulations and show the presence of multiple magnetic orders. The competing orders under spin-frustrated geometry are believed to cause discommensuration and result in the commensurate-to-incommensurate phase transition around 24 K. It is proposed that the low temperature incommensurate phase consists of commensurate domains separated by antiphase domain walls which change both signs of spontaneous polarizations and x-ray scattering amplitudes for forbidden reflections.

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@article{Koo2007NonresonantAR, title={Non-resonant and resonant x-ray scattering studies on multiferroic TbMn2O5.}, author={J W Koo and C Song and S-h Ji and J-S Lee and Jong-Ho Park and T Jang and C M Yang and Y . H . Jeong and K I Lee and T Y Koo and Y. Jeanette Park and J H Kim and Didier Wermeille and Arnold I. Goldman and George Srajer and Sung Hwan Park and S . - W . Cheong}, journal={Physical review letters}, year={2007}, volume={99 19}, pages={197601} }