Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-12-07
Physica B 359-361, 1279-1281 (2005).
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, 1 figure. Proceedings of SCES'04, to appear in Physica B
Scientific paper
10.1016/j.physb.2005.01.356
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 ($H \| c$) while it was enhanced parallel to the easy axis ($H \| b$).
Kuwahara Hideki
Nagayama J.
Nakamura Satoru
Noda Kazufusa
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