论文标题
抗铁磁性中零磁性状态的X射线磁圆二色性效应的存在
Presence of x-ray magnetic circular dichroism effect for zero-magnetization state in antiferromagnetism
论文作者
论文摘要
对于抗铁磁（AFM）状态，通常未观察到X射线磁圆二色性（XMCD），因为来自抗脂质耦合旋转的XMCD信号相互取消。在这封信中，我们从理论上显示了来自kagome晶格上补偿的二维三角AFM结构的XMCD信号。该计算揭示了XMCD光谱与自旋手性的符号之间的完全对应关系：XMCD信号仅在自旋手性为负时才会出现。该XMCD信号源自三个转带体的不同吸收系数，反映了不同的电荷密度各向异性以及自旋和轨道磁矩的方向。
X-ray magnetic circular dichroism (XMCD) is generally not observed for antiferromagnetic (AFM) states because XMCD signals from the antiparallelly coupled spins cancel each other. In this letter, we theoretically show the presence of an XMCD signal from compensated two-dimensional triangle AFM structures on a Kagome lattice. The calculation reveals the complete correspondence between the XMCD spectra and the sign of the spin chirality: the XMCD signal only appears when the spin chirality is negative. This XMCD signal originates from the different absorption coefficients of the three sublattices reflecting different charge density anisotropies and directions of spin and orbital magnetic moments.
