Neutron Spin Echo investigation of spin fluctuations in multiferroics
We used recently high resolution Neutron Spin Echo (NSE) spectroscopy to investigate the critical dynamics at the antiferromagnetic transition and in the SDW phase down to the cycloidal transition. These experiments showed a noticeable broadening of the (0,q,1) magnetic Bragg peak around Tc and the diffuse scattering emerging out of the elastic Bragg peak is quasielastic at all temperatures above the cycloidal transition. In view of these results it becomes urgent to investigate, whether these puzzling features are special to TbMnO3 or intrinsic to mutliferroics. We therefore propose to examine the slow dynamics of MnWO4, which is another multiferroic oxide presenting a similar sequence of magnetic and ferroelectric transitions as TbMnO3.
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HOLBEIN Simon; M. Braden; DUARTE PINTO Serge; FOUQUET Peter; LELIEVRE BERNA Eddy; PAPPAS Catherine and QIAN Feng-Jiao. (2013). Neutron Spin Echo investigation of spin fluctuations in multiferroics. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1300
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