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arXiv 0711.2733cond-mat.mtrl-scicond-mat.str-el
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铁电磁体DyMnO_3的电驱动自旋激发

Electrically driven spin excitation in a ferroelectric magnet DyMnO_3

N. Kida, Y. Ikebe, Y. Takahashi, J. P. He, Y. Kaneko, Y. Yamasaki, R. Shimano, T. Arima, N. Nagaosa, Y. Tokura

摘要:

利用太赫兹时域光谱技术研究了铁电磁体DyMnO $_3$的一整套光极化组态的低能(1- 10 meV)自旋激发电动力学随温度(5- 250 K)和磁场(0- 70 kOe)的变化.我们确定了明显的吸收连续(1- 8毫电子伏)与2毫电子伏左右的峰值功能,这是电偶极子活性仅为轻$E$ -矢量沿a轴。该吸收带的强度随着温度的降低而从铁电转变上方的自旋共线顺电相增长,但与螺旋自旋平面($bc$或$ab$)的取向无关,如在原始$P_{\rm s}$(铁电极化)$\parallel c$相以及磁场诱导的$P_{\rm s}\parallel a$相上所示。这个电偶极活性带的可能起源认为在自旋和自旋电流的大波动。

英文摘要:

Temperature (5--250 K) and magnetic field (0--70 kOe) variations of the low-energy (1--10 meV) electrodynamics of spin excitations have been investigated for a complete set of light-polarization configurations for a ferroelectric magnet DyMnO$_3$ by using terahertz time-domain spectroscopy. We identify the pronounced absorption continuum (1--8 meV) with a peak feature around 2 meV, which is electric-dipole active only for the light $E$-vector along the a-axis. This absorption band grows in intensity with lowering temperature from the spin-collinear paraelectric phase above the ferroelectric transition, but is independent of the orientation of spiral spin plane ($bc$ or $ab$), as shown on the original $P_{\rm s}$ (ferroelectric polarization) $\parallel c$ phase as well as the magnetic field induced $P_{\rm s}\parallel a$ phase. The possible origin of this electric-dipole active band is argued in terms of the large fluctuations of spins and spin-current.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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