通过拉曼散射研究多铁性材料YbMnO₃中的自旋 - 声子耦合
Spin-phonon coupling in multiferroic YbMnO(3) studied by Raman scattering.
作者信息
Fukumura H, Hasuike N, Harima H, Kisoda K, Fukae K, Yoshimura T, Fujimura N
机构信息
Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
出版信息
J Phys Condens Matter. 2009 Feb 11;21(6):064218. doi: 10.1088/0953-8984/21/6/064218. Epub 2009 Jan 20.
Hexagonal YbMnO(3) bulk polycrystals were prepared and studied by Raman scattering in the temperature range of 15-300 K. A total of 15 phonon modes of A(1), E(1) and E(2) type were identified. Some E(2) phonon modes showed anomalous temperature variations in frequency at T(N)∼80 K, suggesting a coupling between the spin and phonon systems below T(N). As another evidence of spin-phonon coupling, softening of an A(1)-phonon mode for the O-Mn vibration was observed at ∼T(N). Substitution of Mn by Al suggests this view.
制备了六角形YbMnO(3)块状多晶体，并在15 - 300 K温度范围内通过拉曼散射对其进行了研究。总共识别出15种A(1)、E(1)和E(2)型声子模式。一些E(2)声子模式在T(N) ∼ 80 K时频率出现异常温度变化，这表明在T(N)以下自旋系统与声子系统之间存在耦合。作为自旋 - 声子耦合的另一个证据，在 ∼ T(N)处观察到O - Mn振动的A(1)声子模式软化。用Al替代Mn支持了这一观点。
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