科研之友
微信
新浪微博
Facebook
分享链接
摘要
CuFeO2 is one of the multiferroic materials and is the first case that the electric polarization is not explained by the magnetostriction model or the spin-current model. We have studied this material using soft x-ray resonant diffraction and found that superlattice reflection 0 1 - 2q 0 appears in the ferroelectric and incommensurate magnetic ordered phase at the Fe L-2,L-3 absorption edges and moreover that the rotation of the x-ray polarization such as from sigma to pi or from pi to sigma is allowed at this reflection. These findings definitely provide direct evidence that the 3d t(2g down arrow) orbital state of Fe ions has a long-range order in the ferroelectric state. The spin-orbit interaction in Fe ions plays a crucial role to the ferroelectricity in CuFeO2, coupling two nontrivial spin and orbital orders, both of which break the crystal symmetry.
- 出版日期2012-9-19
