Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition.
The proposal aims to investigate the critical dynamics of the helix structure in MnGe by neutron spin echo technique. The magnetic system of MnGe compound has a cubic B20 structure with the lattice constant a=0.4806 nm has ordered below TC = 130 K in a ferromagnetic spiral along the <1 1 1> directions. The scattering patterns show dramatic changes in the temperature evolution of the magnetic structure. . A typical powder pattern, which can be observed below T = 80 K, becomes narrower and the inner part of the ring is contaminated by an additional scattering with temperature increase. The ring is smeared and the contaminating contribution inside the ring is comparable to the intensity of the ring at the critical temperature at TN = 130 K. We assume that this additional scattering has inelastic nature. Dynamics plays a crucial role in understanding of critical phenomena. We propose to measure the temperature and the wave number dependence of the relaxation rate of critical spin fluctuations. We expect to observe two crossovers in the temperature behaviour of the relaxation rate.
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ALTYNBAEV Evgeniy; CHERNYSHOV Dmitry; FOUQUET Peter; S.V. Grigoriev; LOTT Dieter; MENZEL Dirk; MOSKVIN Evgeny and SIEGFRIED Sven-Arne. (2015). Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-444
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