Ferroelectricity in an s=1/2 chain cuprate.
Ferroelectricity in an s=1/2 chain cuprate.
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DOI：
10.1103/physrevlett.98.057601
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发表时间：
2007-01
影响因子：
8.6
通讯作者：
S. Park;Y. J. Choi;Chenglin Zhang;S. Cheong
中科院分区：
文献类型：
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作者：
S. Park;Y. J. Choi;Chenglin Zhang;S. Cheong
我们报告了在量子准一维 (1D) S=1/2 LiCu2O2 磁体中螺旋磁态铁电性的发现。在螺旋磁序温度以下，电极化 (P) 沿 c 方向出现，但当沿 b 方向施加磁场 (H) 时，电极化从 c 轴变为 a 轴。我们还发现P(c)随着H(c)的增加而增加，P(a)随着H(a)的增加而增加。零场中的LiCu2O2似乎是第一个铁电铜酸盐，也是“一维螺旋磁性铁电体”的典型例子。然而，H 中的意外行为可能证明了 LiCu2O2 的 1D S=1/2 磁体固有的有序自旋构型的复杂性。
We report our discovery of ferroelectricity in the spiral-magnetic state in the quantum quasi-one-dimensional (1D) S=1/2 magnet of LiCu2O2. Electric polarization (P) emerges along the c direction below the spiral-magnetic order temperature, but changes from the c to a axis when magnetic fields (H) are applied along the b direction. We also found that P(c) increases with H(c), and P(a) appears with H(a). LiCu2O2 in zero field appears to be the first ferroelectric cuprate and also a prototypical example of the "1D spiral-magnetic ferroelectrics." However, the unexpected behavior in H may demonstrate the complexity of the ordered spin configuration, inherent in the 1D S=1/2 magnet of LiCu2O2.