Ferroelectricity in an Ising chain magnet
Ferroelectricity in an Ising chain magnet
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DOI：
10.1103/physrevlett.100.047601
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发表时间：
2008-02-01
影响因子：
8.6
通讯作者：
Cheong, S. -W.
中科院分区：
文献类型：
--
作者：
Choi, Y. J.;Yi, H. T.;Cheong, S. -W.
本文报道了在Ising链磁体Ca(3)Co(2-x)Mn(X)O(6)(x约为0.96)中发现了共线磁驱动的铁电性。中子衍射表明，Co(2+)和Mn(4+)离子沿链交替排列，表现出向上-向上-向下(上箭头、上箭头、下箭头、下箭头)的磁序。铁电性是由于上箭头、上箭头、下箭头、下箭头自旋链中的反转对称性以交替的电荷顺序破坏而产生的。与螺旋磁电材料中的反对称交换耦合是活跃的不同，Ca(3)(Co，Mn)(2)O(6)中的对称性破缺是通过与对称超交换有关的交换伸缩而发生的。
We report discovery of collinear-magnetism-driven ferroelectricity in the Ising chain magnet Ca(3)Co(2-x)Mn(x)O(6) (x approximate to 0.96). Neutron diffraction shows that Co(2+) and Mn(4+) ions alternating along the chains exhibit an up-up-down-down (up arrow up arrow down arrow down arrow) magnetic order. The ferroelectricity results from the inversion symmetry breaking in the up arrow up arrow down arrow down arrow spin chain with an alternating charge order. Unlike in spiral magnetoelectrics where antisymmetric exchange coupling is active, the symmetry breaking in Ca(3)(Co,Mn)(2)O(6) occurs through exchange striction associated with symmetric superexchange.