Magnetic-field induced competition of two multiferroic orders in a triangular-lattice helimagnet MnI2.
Magnetic-field induced competition of two multiferroic orders in a triangular-lattice helimagnet MnI2.
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DOI：
10.1103/physrevlett.106.167206
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发表时间：
2011-03
影响因子：
8.6
通讯作者：
T. Kurumaji;S. Seki;S. Ishiwata;H. Murakawa;Y. Tokunaga;Y. Kaneko;Y. Tokura
中科院分区：
文献类型：
--
作者：
T. Kurumaji;S. Seki;S. Ishiwata;H. Murakawa;Y. Tokunaga;Y. Kaneko;Y. Tokura
本文研究了三角晶格螺旋磁MnI 2的磁性和介电性质随磁场H大小和方向的变化。在低于3.5K的适当螺旋磁基态中出现面内电极化P，显示了由面内H控制的六种可能的多铁性畴的重排。随着H绕[001]轴每旋转60°，由于磁调制矢量q的翻转，观察到P矢量的不连续120°翻转。然而，随着面内H增加到3 T以上，稳定的q方向从q（110[<$over 0]）改变到q（110），导致在旋转H下P触发器图案的改变。在临界场区（103 T），由于相位竞争和由此产生的增强的q柔性，P矢量平滑地顺时针旋转两次，而H矢量逆时针旋转一次。
Magnetic and dielectric properties with varying magnitude and direction of magnetic-field H have been investigated for a triangular-lattice helimagnet MnI_{2}. The in-plane electric polarization P emerges in the proper screw magnetic ground state below 3.5 K, showing the rearrangement of six possible multiferroic domains as controlled by the in-plane H. With every 60° rotation of H around the [001] axis, discontinuous 120° flop of the P vector is observed as a result of the flop of magnetic modulation vector q. With increasing the in-plane H above 3 T, however, the stable q direction changes from q‖(110[ ¯over 0]) to q‖(110), leading to a change of P-flop patterns under rotating H. At the critical field region (∼3 T), due to the phase competition and resultant enhanced q flexibility, the P vector smoothly rotates clockwise twice while the H vector rotates counterclockwise once.