Abstract
A number of magnetic and structural phase transitions in EuMn 2O 5 is observed below T N ≃ 40 K by neutron diffraction on a single crystal. The magnetic structure just below T N is incommensurate with the propagation vector ( 1 2 0 0.3) . A ferroelectric transition occurs at T N with the polar displacements of Mn 3 + ions along axis a . Three-dimensional polarization analysis has shown, that magnetic moments lie in a – c plane down to T 1≃ 22 K. Second structural transition, mainly due to the polar shifts of the Mn 4 + ions along c , is observed at T 1. It is accompanied by a magnetic phase transition and by appearance of the b-component of spins.
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