Role of commensurability of spin order for optical magnetoelectric effect with electromagnons in multiferroic YMn2O5

被引：10
|
作者：
Masuda, R. [1 ,2 ]
Kaneko, Y. [3 ]
Yamasaki, Y. [1 ,2 ,3 ]
Tokura, Y. [1 ,2 ,3 ]
Takahashi, Y. [1 ,2 ,3 ,4 ]
机构：
[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[2] Univ Tokyo, QPEC, Tokyo 1138656, Japan
[3] RIKEN, CEMS, Wako, Saitama 3510198, Japan
[4] Japan Sci & Technol Agcy, PRESTO, Chiyoda Ku, Tokyo 1028666, Japan
来源：
PHYSICAL REVIEW B | 2017年 / 96卷 / 04期
基金：
日本科学技术振兴机构;
关键词：
POLARIZATION; FIELDS;
D O I：
10.1103/PhysRevB.96.041117
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The optical magnetoelectric effect, which produces the nonreciprocal directional dichroism, on the electromagnon resonances is investigated for multiferroic phases of YMn2O5 by terahertz spectroscopy. For the electromagnon driven by the exchange striction, the crucial role of the commensurability of spin order in the magnetoelectric coupling is manifested by the suppression of the directional dichroism in the incommensurate spin phase. Furthermore, the gapped electromagnon via the spin-current mechanism is identified in terms of the directional dichroism, irrespective of commensurability/incommensurability in the cycloidal spin order.
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页数：5
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