Ferroelectricity in perovskite $HoMn{O}_3$ and $YMn{O}_3$

Abstract

Ferroelectricity is observed in orthorhombic $HoMn{O}_3$ and $YMn{O}_3$ at the magnetic lock-in transitions into an E-type structure or an incommensurate phase with a temperature independent wave vector, respectively. In $HoMn{O}_3$ the ferroelectric polarization strongly depends on the external magnetic field indicating the involvement of the rare earth moment order in this compound. The results are discussed within the framework of recent theoretical models, in particular the double exchange driven polar displacements predicted for E-type magnetic structures.

5 pages, 3 figures

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