自旋= 1/2链铜氧化物LiCuVO4中外磁场切换铁电极化
Switching the Ferroelectric Polarization by External Magnetic Fields in the Spin = 1/2 Chain Cuprate LiCuVO4
摘要：
本文详细研究了多铁性LiCuVO_4的复介电常数和铁电极化随温度和外加磁场的变化。在零外磁场中，建立了具有ab螺旋和沿晶体学b方向传播矢量的螺旋自旋序，从而诱导出自发极化平行于a的铁电序。螺旋的方向可以通过外部磁场重新定向，并允许自发极化的切换。我们发现了一个很强的依赖性的绝对值的偏振螺旋平面的不同取向。高于7.5 T，LiCuVO 4揭示共线自旋顺序，并保持顺电的所有领域的方向。因此，该系统非常适合于检查理论上预测的螺旋磁体的对称关系。铁电和磁序的强耦合被证明，并充分探索了复杂的（B，T）相图。
英文摘要：
We present a detailed study of complex dielectric constant and ferroelectric polarization in multiferroic LiCuVO4 as function of temperature and external magnetic field. In zero external magnetic field, spiral spin order with an ab helix and a propagation vector along the crystallographic b direction is established, which induces ferroelectric order with spontaneous polarization parallel to a. The direction of the helix can be reoriented by an external magnetic field and allows switching of the spontaneous polarization. We find a strong dependence of the absolute value of the polarization for different orientations of the spiral plane. Above 7.5 T, LiCuVO4 reveals collinear spin order and remains paraelectric for all field directions. Thus this system is ideally suited to check the symmetry relations for spiral magnets as predicted theoretically. The strong coupling of ferroelectric and magnetic order is documented and the complex (B,T) phase diagram is fully explored.
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