Magnetic-field-induced transition in the lattice modulation of colossal magnetoelectric GdMnO3 and TbMnO3 compounds -: art. no. 100102

被引:132
作者
Arima, T [1 ]
Goto, T
Yamasaki, Y
Miyasaka, S
Ishii, K
Tsubota, M
Inami, T
Murakami, Y
Tokura, Y
机构
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
[2] Japan Sci & Technol Agcy, ERATO, Spin Superstruct Project, Tsukuba, Ibaraki 3058562, Japan
[3] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[4] Japan Atom Energy Res Inst, Synchrotron Radiat Res Ctr, Hyogo 6795148, Japan
[5] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
关键词
D O I
10.1103/PhysRevB.72.100102
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Single-crystal synchrotron x-ray diffraction measurements in strong magnetic fields have been performed for magnetoelectric compounds GdMnO3 and TbMnO3. It has been found that the P parallel to a ferroelectric phase induced by the application of a magnetic field at low temperatures is characterized by commensurate lattice modulation along the orthorhombic b axis with q=1/2 and q=1/4. The lattice modulation is ascribed to antiferromagnetic spin alignment with a modulation vector of (0 1/4 1). The change of the spin structure is directly correlated with the magnetic-field-induced electric phase transition, because any commensurate spin modulation with (0 1/4 1) should break glide planes normal to the a axis of the distorted perovskite with the Pbnm space group.
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