论文标题
抗铁磁性狄拉克材料eummbi $ _2 $中的野外诱导的自旋重新定位由中子和共振X射线衍射揭示
Field-induced spin reorientation in the antiferromagnetic Dirac material EuMnBi$_2$ revealed by neutron and resonant x-ray diffraction
论文作者
论文摘要
单晶中子衍射和谐振X射线磁衍射技术详细研究了分层狄拉克材料Eumnbi $ _2 $的场相关磁结构。根据零场的抗铁磁相的反射条件，发现欧盟矩在$ AB $平面内订购的欧盟矩，并以$ c $轴沿上下倒下的顺序沿$ c $轴堆叠。 Upon the spin-flop transition under the magnetic field parallel to the $c$ axis, the Eu moments are reoriented from the $c$ to the $a$ or $b$ directions forming two kinds of spin-flop domains, whereas the antiferromagnetic structure of the Mn sublattice remains intact as revealed by the quantitative analysis of the change in the neutron diffraction intensities.本研究提供了一个具体的基础，以讨论欧盟Sublattice在Eumnbi $ _2 $中Dirac Fermion Transport增强的二维运输方面的主要作用。
Field-dependent magnetic structure of a layered Dirac material EuMnBi$_2$ was investigated in detail by the single crystal neutron diffraction and the resonant x-ray magnetic diffraction techniques. On the basis of the reflection conditions in the antiferromagnetic phase at zero field, the Eu moments were found to be ordered ferromagnetically within the $ab$ plane and stacked antiferromagnetically along the $c$ axis in the sequence of up-up-down-down. Upon the spin-flop transition under the magnetic field parallel to the $c$ axis, the Eu moments are reoriented from the $c$ to the $a$ or $b$ directions forming two kinds of spin-flop domains, whereas the antiferromagnetic structure of the Mn sublattice remains intact as revealed by the quantitative analysis of the change in the neutron diffraction intensities. The present study provides a concrete basis to discuss the dominant role of the Eu sublattice on the enhanced two-dimensionality of the Dirac fermion transport in EuMnBi$_2$.
