Magnetic field induced sign reversal of the anomalous Hall effect in a pyrochlore ferromagnet Nd2Mo2O7:: Evidence for a spin chirality mechanism -: art. no. 257202

被引:71
作者
Taguchi, Y [1 ]
Sasaki, T
Awaji, S
Iwasa, Y
Tayama, T
Sakakibara, T
Iguchi, S
Ito, T
Tokura, Y
机构
[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
[4] Natl Inst Adv Ind Sci & Technol, CERC, Tsukuba, Ibaraki 3058562, Japan
[5] Japan Sci & Technol Corp, ERATO, SSS, Tsukuba, Ibaraki 3058562, Japan
关键词
D O I
10.1103/PhysRevLett.90.257202
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The anisotropic Hall effect and magnetization have been investigated for single crystals of Nd2Mo2O7 under high magnetic fields up to 27 T and at low temperatures down to 50 mK. The magnetization curves indicate that the Nd moments with strong Ising anisotropy are coupled antiferromagnetically with the Mo spins and show field-induced flipping on the respective sites. The Hall resistivity changes its sign with increasing field applied along the [111] direction, while it monotonously approaches zero with the field applied along the [100] or [110] direction. This behavior is in accord with the prediction by the Berry phase theory and is interpreted in terms of the field-induced reversal of spin chirality on the pyrochlore lattice.
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页数:4
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