Magnetic-Field and External-Pressure Control of Ferroelectricity in Multiferroic Manganites

Abstract

We have investigated dielectric properties in a series of crystals of $R$MnO${}_3$ ($R$ is a rare earth ion) under magnetic fields and quasihydrostatic pressure. We have found that ferroelectric phase appeared in GdMnO${}_3$ crystal below 13K. We have confirmed that a small spontaneous polarization exists along a axis ($P_a$) in the orthorhombic $Pbnm$ setting and that $P_a$ can be reversed by the dc electric field. The dielectric anomaly due to the ferroelectric transition accompanied thermal hysteresis and lattice striction. The ferroelectric transition temperature decreased with quasihydrostatic pressure. These results indicate that the ferroelectric transition is improper and is of the first-order displacement-type one. $P_a$ was easily collapsed by application of magnetic field of 0.4T parallel to the spin-canting direction ($H\Vert c$) while it was enhanced parallel to the easy axis ($H\Vert b$).

arXiv comment2 pages, 1 figure. Proceedings of SCES'04, to appear in Physica B

References in corpus (2)

• Distorted Perovskite with e_g^1 Configuration as a Frustrated Spin System
• Complex interplay of 3d and 4f magnetism in La:GdMnO3

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• Single-axis dependent structural and multiferroic properties of orthorhombic RMnO${}_3$ (R = Gd - Lu)
• Persistent and Reversible Phase Control in GdMnO${}_3$ near the Phase Boundary
• Control of ferroelectric phase by chemical pressure in (Gd,Tb)MnO${}_3$ crystals
• Control of the ferroelectricity in metastable state for orthorhombic $R$MnO${}_3$ crystals
• Structural and magnetic study of PrMn${}_{1-x}$Fe${}_x$O${}_3$ $(0\le x\le 1)$ compounds