Ferroelectricity in an Ising chain magnet

被引：406
作者：
Choi, Y. J. [1 ,2 ]
Yi, H. T. [1 ,2 ]
Lee, S. [1 ,2 ]
Huang, Q. [3 ]
Kiryukhin, V. [1 ,2 ]
Cheong, S. -W. [1 ,2 ]
机构：
[1] Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA
[2] Dept Phys & Astron, Piscataway, NJ 08854 USA
[3] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 04期
关键词：
ONE-DIMENSIONAL OXIDES; MULTIFERROICS; POLARIZATION; CRYSTAL;
D O I：
10.1103/PhysRevLett.100.047601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：4
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