Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-12-07
Journal of Applied Physics 97, 10C103 (2005).
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, RevTeX4, Proceedings of MMM 2004, appear in J. Appl. Phys
Scientific paper
10.1063/1.1851420
We have investigated dielectric properties in Mott insulators GdMnO$_{3}$ and TbMnO$_{3}$ under magnetic fields and external quasihydrostatic pressures. In the case of GdMnO$_{3}$, thermal hysteresis for dielectric constant $\epsilon$ and discontinuous lattice distortion were observed at ferroelectric transition temperature ($T_{C}$), and ferroelectric spontaneous polarization was suppressed by application of external pressure. These results indicate that the ferroelectric transition in GdMnO$_{3}$ is a first-order displacive-type one. On the other hand, the thermal hysteresis and discontinuous lattice striction were not observed at $T_{C}$ in TbMnO$_{3}$. The peak of $\epsilon$ corresponding to ferroelectric transition was shifted toward higher temperatures by application of external pressure in TbMnO$_{3}$. The ferroelectric transition of TbMnO$_{3}$ was thought to be a second-order order-disorder-type one.
Kuwahara Hideki
Nagayama J.
Nakamura Satoru
Noda Kazufusa
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