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Дата последнего поиска статьи во внешних источниках: 18 сентября 2014 г.
Аннотация:A long- standing issue, the magnetic structure of the so-called X phase of MnWO4, has been solved by single- crystal neutron diffraction. Emerging from the well- known ferroelectric phase which presents an electric polarization P//b and which is induced by a cycloidal magnetic order called AF2, this phase is reached by application of a magnetic field along the b axis and is characterized by a flop of the electric polarization towards the a axis. We have identified this phase as a reoriented cycloidal spin structure, AF2', and its evolution from the AF2 phase has been thoroughly described. Unlike for the usual magnetic-field-induced spin-flop transitions, this high- field flopped phase does nor directly develop from the low- field phase but emerges via the nonpolar collinear commensurate AF1 phase, which creeps in between. The evolution is in good agreement with the observed field- induced change in Pb and Pa electrc polarization as with magnetic susceptibility data