Infrared signature of ion displacement in the noncollinear spin state of orthorhombic YMnO3

被引：26
|
作者：
Kim, Jungho
Jung, Sunghoon
Park, M. S.
Lee, Sung-Ik
Drew, H. D.
Cheong, H.
Kim, K. H.
Choi, E. J. [1 ]
机构：
[1] Univ Seoul, Dept Phys, Seoul 130743, South Korea
[2] Seoul Natl Univ, Ctr Strongly Correlated Mat Res, Sch Phys, Seoul 151742, South Korea
[3] Pohang Univ Sci & Technol, Natl Creat Res Initiat Ctr Superconduct, Pohang 790784, South Korea
[4] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea
[5] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[6] Sogang Univ, Dept Phys, Seoul 121742, South Korea
来源：
PHYSICAL REVIEW B | 2006年 / 74卷 / 05期
关键词：
D O I：
10.1103/PhysRevB.74.052406
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have measured far-infrared (IR) phonon spectra of orthorhombic YMnO3 as a function of temperature. In the ferroelectric phase below T-FE=31 K, a new absorption peak appears at 620 cm(-1) and grows with decreasing T. Supplementary Raman phonon measurement shows that the IR peak is derived from B-2g(1) Raman phonon. The result indicates that an inversion symmetry breaking structural change takes place in the ferroelectric state. Possible origin of the change is discussed in the context of ion displacement induced by the noncollinear spin alignment.
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页数：4
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