Abstract
We have studied magnetic orderings of a ferroelectric TmMn 2 O 5 by single-crystal neutron diffraction and dielectric measurements. Below T N1 = 44 K, TmMn 2 O 5 shows the sequence of magnetic phase transitions at T = 36.4, 35.1 and 24.9 K, associated with changes in the magnetic propagation vector q = ( q x ,0, q z ). Such magnetic phase transitions are quite similar to those of YMn 2 O 5 with non-magnetic Y ion reported previously. In addition, we observed another magnetic phase transition at T = 4.8 K which implies a dramatic reorientation of Mn moments induced by the rare-earth Tm moment. The agreement between the temperatures of the magnetic and ferroelectric phase transitions indicates that the ferroelectric ordering is strongly correlated with the magnetic ordering.
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