Ferroelectric transition induced by the incommensurate magnetic ordering in LiCuVO4
Ferroelectric transition induced by the incommensurate magnetic ordering in LiCuVO4
复制标题
DOI：
10.1143/jpsj.76.023708
复制
发表时间：
2007-02-01
影响因子：
1.7
通讯作者：
Sato, Masatoshi
中科院分区：
文献类型：
--
作者：
Naito, Yutaka;Sato, Kenji;Sato, Masatoshi
在多晶和单晶LiCuVO 4样品中发现了与螺旋自旋顺序同时发生的铁电转变。该系统具有Cu 2+自旋（s = 1/2）的CuO 2链形成的边缘共享CuO 4广场。可能是由于最近邻和次最近邻交换相互作用之间的竞争所引起的受抑性质，Cu自旋表现出螺旋磁序，如已经报道的那样，其具有沿链方向的无公度调制矢量Q沿着和垂直于CuO 4正方形的螺旋轴e（3）。电极化P可以通过最近预测的P与Q x e（3）成比例的关系来理解。已发现的转变温度逐渐抑制所施加的磁场。
A ferroelectric transition occurring simultaneously with a helical spin order has been found in both the polycrystalline and single-crystal samples of LiCUVO4. The system has Cu2+ spins (s = 1/2) of the CuO2 chains formed of edge-sharing CuO4 squares. Possibly due to the frustrated nature caused by a competition between the nearest-neighbor and next-nearest-neighbor exchange interactions, Cu spins exhibit, as has been already reported, the helical magnetic order with the incommensurate modulation vector Q along the chain direction and with the helical axis e(3) perpendicular to the CuO4 squares. The electric polarization P can be understood by the recently predicted relation P proportional to Q x e(3). The transition temperature has been found to be gradually suppressed by the applied magnetic field.