BaFe2As2表面畴和畴壁：体自旋结构的模拟
BaFe2As2 Surface Domains and Domain Walls: Mirroring the Bulk Spin Structure
摘要：
高分辨率扫描隧道显微镜（STM）测量BaFe 2As 2-铁基超导体的母体化合物之一-揭示了（001）表面上的（1x 1）As终止的晶胞。然而，有显着差异的表面晶胞相比，散装：只有一个的两个原子在晶胞中的成像和域壁之间的不同（1x 1）区域显示C2对称的表面。如果STM图像反映了表面或斜方体的几何结构，那么它应该是C2 v。不等价的As原子和畴壁的偏压依赖性表明STM图像的起源主要是电子的而不是几何的。我们认为，表面电子形貌镜体自旋结构的BaFe 2As 2，通过强的轨道-自旋耦合。
英文摘要：
High-resolution scanning tunneling microscopy (STM) measurements on BaFe2As2-one of the parent compounds of the iron-based superconductors-reveals a (1x1) As-terminated unit cell on the (001) surface. However, there are significant differences of the surface unit cell compared to the bulk: only one of the two As atoms in the unit cell is imaged and domain walls between different (1x1) regions display a C2 symmetry at the surface. It should have been C2v if the STM image reflected the geometric structure of the surface or the orthorhombic bulk. The inequivalent As atoms and the bias dependence of the domain walls indicate that the origin of the STM image is primarily electronic not geometric. We argue that the surface electronic topography mirrors the bulk spin structure of BaFe2As2, via strong orbital-spin coupling.
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