Magnetic-Field-Induced Polarization Flop in Multiferroic TmMn2O5
Magnetic-Field-Induced Polarization Flop in Multiferroic TmMn2O5
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DOI：
10.1103/physrevlett.103.077204
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发表时间：
2009-08-14
影响因子：
8.6
通讯作者：
Kohn, K.
中科院分区：
文献类型：
--
作者：
Fukunaga, M.;Sakamoto, Y.;Kohn, K.
通过沿 c 轴施加约 0.5 T 的磁场，我们在低于 5 K 的多铁性 TmMn2O5 中发现了从 a 轴 (P-a) 到 b 轴 (P-b) 的可逆电极化随角异色。这种现象是稀土 (R) 化合物 RMn2O5 的第一个例子。这种磁场引起的极化随角异色对应于从一个不相称磁 (ICM) P-a 相到另一个 ICM P-b 相的磁相变，相当于无磁场下温度高于 5 K 的 ICM P-b 相。通过偏振中子衍射在P-b相中观察到的bc平面的自旋手性在ICM P-a相中消失。这表明 TmMn2O5 ICM 相的极化是由 S-i x S-j 型相互作用引起的。
We discovered a reversible electric polarization flop from the a axis (P-a) to the b axis (P-b) in multiferroic TmMn2O5 below 5 K by applying a magnetic field of approximately 0.5 T along the c axis. This phenomenon is the first example of the rare-earth (R) compound RMn2O5. This magnetic-field-induced polarization flop corresponds to a magnetic phase transition from one incommensurate magnetic (ICM) P-a phase to another ICM P-b phase, which is equivalent to an ICM P-b phase above 5 K under no magnetic field. The spin chirality in the bc plane, which was observed in the P-b phase by polarized neutron diffraction, disappeared in the ICM P-a phase. This indicates that the polarization in the ICM phases of TmMn2O5 was induced by an S-i x S-j-type interaction.