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  Argyriou, D.N.; Aliouane, N.; Strempfer, J.; Zegkinoglou, I.; Bohnenbuck, B.; Habicht, K.; Zimmermann, M.v.: Melting of incommensurate-ferroelectric phase with magnetic field in multiferroic TbMnO₃. Physical Review B 75 (2007), p. 020101/1-4

10.1103/PhysRevB.75.020101

Abstract:
We have investigated the reentrant ferroelectric behavior of TbMnO3 under a c-axis-aligned magnetic field H||c using neutron and x-ray single-crystal diffraction. We find that below TN=41 K and at high field the incommensurate ordering of Mn spins melts and coincides with the disappearance of ferroelectricity. The paraelectric phase which emerges is characterized by a simple commensurate antiferomagnetic ordering. We suggest that the reentrance of ferroelectricity at low temperatures and high magnetic field coincides with the development of incommensurate Mn- and Tb-spin ordering.