Field-induced phase transitions and magnetoferroelectricity in the perfect triangular lattice antiferromagnet RbFe(MoO 4 ) 2 in a vertical magnetic field
Field-induced phase transitions and magnetoferroelectricity in the perfect triangular lattice antiferromagnet RbFe(MoO 4 ) 2 in a vertical magnetic field
复制标题
垂直磁场中完美三角晶格反铁磁体 RbFe(MoO 4 ) 2 的场致相变和磁铁电性
DOI：
10.1016/j.jmmm.2015.08.013
复制
发表时间：
2016
影响因子：
2.7
通讯作者：
T. Sakakibara
中科院分区：
文献类型：
--
作者：
H. Mitamura;R. Watanuki;N. Onozaki;Y. Amou;Y. Kono;S. Kittaka;Y. Shimura;I. Yamamoto;Kazuya Z. Suzuki;T. Sakakibara
我们在沿c轴施加的高磁场B中对完美三角晶格反铁磁体RbFe (moo4) 2进行了电极化P、介电常数λ和磁化M测量。在T= 1.5 K处，M (B)随B单调增加，直至B = 21 T达到饱和，而P (B)在14 T左右消失，远低于饱和点。在13≤B≤14 T范围内，2.8 K以下的温度变化呈双峰结构，表明两个连续的转变。这些结果强烈表明存在一个新的高场相；磁性结构由具有手性的低场圆锥形变为无手性的高场共面非共线结构。得到的相图与类xy海森堡自旋三角形晶格反铁磁体的理论预测一致。
We performed electric polarization P, dielectric constant ϵ and magnetization M measurements on the perfect triangular-lattice antiferromagnet RbFe (MoO 4) 2 in high magnetic fields B applied along the c-axis. Whereas M (B) at T= 1.5 K monotonically increases with B up to the saturation at B s= 21 T, P (B) disappears about 14 T, far below the saturation point. In a field range 13≤ B≤ 14 T, the temperature variation of ϵ shows a double peak structure below 2.8 K, indicating two successive transitions. These results strongly suggest the presence of a new high-field phase; the magnetic structure changes from a low-field conical state having chirality to a high-field coplanar non-collinear structure without chirality. The obtained phase diagram is in agreement with a theoretical prediction on XY-like Heisenberg spin triangular lattice antiferromagnets.