Magnetic order and ferroelectricity in RMnO₃multiferroic manganites: coupling between R- and Mn-spins

Abstract

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Effects of Al substitution on the multiferroic properties of TbMnO3

“…A sudden decrease in the integrated intensity is observed at 8 K correlated to the onset of the Tb 3+ magnetic ordering. Similar features have been reported in related compounds 8,33 but this result must be taken with care as the determination of the peak intensities is blurred by the anomalous background increase related to the observed diffuse scattering in Fig. 6(a).…”

Mechanism of exchange striction of ferroelectricity in multiferroic orthorhombic HoMnO3single crystals

“…In fact, rare-earth -3d element interaction was reported to be essential in multiferroic orthoferrites [14,15], as well as to play a role in some spiral manganites [16,17]. We find that Ho-Mn exchange striction indeed provides a simple explanation for the observed phenomena.…”

Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure

“…5c as a T versus B phase diagram stacked with the contour plot of the magnitude of P. As seen in the phase diagram, there are two distinct ferroelectric phases with different magnitude of ferroelectric polarization (separated by the phase boundary marked by diamond symbols). At the lowest T, P is steeply enhanced by applying B above B2 T. In the case of the ambient-pressure condition, it is known that the application of B along the a axis causes a flop of P from the P//c phase with the bc cycloid to the P//a phase with the ab cycloid 30,31 . That is, the application of B along a stabilizes the P//a phase at ambient pressure.…”