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論文

Unconventional ferroelectric transition in the multiferroic compound TbMnO$$_{3}$$ revealed by the absence of an anomaly in $$c$$-polarized phonon dispersion

梶本 亮一; 佐賀山 基*; 佐々井 健蔵*; 福田 竜生; 筒井 智嗣*; 有馬 孝尚*; 廣田 和馬*; 三井 由佳利*; 吉澤 英樹*; Baron, A. Q. R.*; et al.

Physical Review Letters, 102(24), p.247602_1 - 247602_4, 2009/06

 被引用回数:12 パーセンタイル:59.08(Physics, Multidisciplinary)

TbMnO$$_{3}$$ exhibits a spontaneous electric polarization along $$mathbf{c}$$ concomitantly with a spiral spin ordering modulated along $$mathbf{b}$$ below $$T$$$$_{rm c}$$ = 28 K. We have performed inelastic X-ray scattering measurements on a single crystal of TbMnO$$_{3}$$ to clarify whether phonon anomalies related to the ferroelectricity exist. We measured transverse modes, especially the Mn-O-Mn bending mode polarized along $$mathbf{c}$$ and propagating along $$mathbf{b}$$, which we expect is most relevant to the ferroelectricity. However, no anomaly was found in the phonon dispersion below 50 meV across $$T$$$$_{rm c}$$. The present result suggests that the mechanism of ferroelectricity in TbMnO$$_3$$ is different from that of a conventional displacive-type ferroelectric. The weak coupling between electric polarization and lattice in TbMnO$$_{3}$$ strongly suggests that the ferroelectricity is mainly derived from the spiral spin ordering.

口頭

Inelastic X-ray scattering study of phonons in the multiferroic compound TbMnO$$_3$$

梶本 亮一; 佐賀山 基*; 佐々井 健蔵*; 福田 竜生; 筒井 智嗣*; 有馬 孝尚*; 廣田 和馬*; 三井 由佳利*; 吉澤 英樹*; Baron, A. Q. R.*; et al.

no journal, , 

An inelastic X-ray scattering study on a single crystal of TbMnO$$_3$$ was performed to reveal whether phonon anomaly related to the appearance of the ferroelectricity exists. We have measured the transverse modes, especially the Mn-O-Mn bending mode, polarized along the $$c$$ axis propagating along the $$b$$ axis, because these modes are expected to be most relevant to the spontaneous electric polarization along the $$c$$ axis concomitantly with the spiral spin ordering modulated along the $$b$$ axis. However, no anomaly in phonon dispersions was observed even below the ferroelectric transition temperature below 50 meV. The present result suggests that the mechanism of ferroelectric transition in $$R$$MnO$$_3$$ is different from that of a conventional displacive-type ferroelectric.

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