Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-10-16
Journal of Magnetism and Magnetic Materials, Volume 310, Issue 2, Part 2, March 2007, Pages 1162-1164
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, 1 figure, the proceeding of International Conference of Magnetism, to be published in the Journal of Magnetism and Ma
Scientific paper
10.1016/j.jmmm.2006.10.337
We have investigated the role of the 4$f$ moment on the magnetoelectric (ME) effect of orthorhombic $R$MnO$_{3}$ ($R$=rare earth ions). In order to clarify the role of the 4$f$ moment, we prepared three samples: (Eu,Y)MnO$_{3}$ without the 4$f$ moment, TbMnO$_{3}$ with the anisotropic 4$f$ moment, and (Gd,Y)MnO$_{3}$ with the isotropic 4$f$ moment. The ferroelectric behaviors of these samples are different from each other in a zero magnetic field. (Eu,Y)MnO$_{3}$ and (Gd,Y)MnO$_{3}$ show the ferroelectric polarization along the a axis in the ground state, while TbMnO$_{3}$ shows it along the c axis. Such difference may arise from the influence of the anisotropic Tb$^{3+}$ 4$f$ moment. The direction of the ferroelectric polarization of $R$MnO$_{3}$ is determined by the internal magnetic field arising from the 4$f$ moment.
Akahoshi Daisuke
Akaki Mitsuru
Kuwahara Hideki
Nakamura Fumihiko
Noda Kazufusa
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