BaFe2As2单晶磁序的中子散射研究
Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2
摘要：
在ThCr_2Si_2型FeAs基超导体发现后不久，BaFe_2As_2的磁结构就完全由多晶中子衍射测量确定。磁矩方向和面内反铁磁波矢都沿正交晶胞的长a轴。在140K附近只有一个组合磁结构转变。然而，后来的单晶中子衍射工作报告了矛盾的结果。在这里，我们展示了中子衍射结果从一个干净的单晶样品，生长的自通量方法，支持原来的多晶工作。
英文摘要：
The magnetic structure of BaFe2As2 was completely determined from polycrystalline neutron diffraction measurements soon after the ThCr2Si2-type FeAs-based superconductors were discovered. Both the moment direction and the in-plane antiferromagnetic wavevector are along the longer a-axis of the orthorhombic unit cell. There is only one combined magnetostructural transition at about 140 K. However, a later single-crystal neutron diffraction work reported contradicting results. Here we show neutron diffraction results from a clean single crystal sample, grown by a self-flux method, that support the original polycrystalline work.
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