Spin Waves in Detwinned BaFe2As2
Spin Waves in Detwinned BaFe2As2
复制标题
解孪生 BaFe2As2 中的自旋波
DOI：
10.1103/physrevlett.121.067002
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发表时间：
2018-08-08
影响因子：
8.6
通讯作者：
Dai, Pengcheng
中科院分区：
文献类型：
--
作者：
Lu, Xingye;Scherer, Daniel D.;Dai, Pengcheng
理解高温超导体母体化合物中的磁相互作用是确定它们在超导机制中作用的基础。对于铁磷属元素化物超导体的母体化合物，如AFe（2）As（2）（A = Ba，Ca，Sr），尽管自旋激发已经在整个布里渊区被绘制出来，但是相应的测量是在孪生样品上进行的，并且不允许对自旋动力学进行决定性的确定。在这里，我们使用非弹性中子散射完全映射出类似于100%的退孪BaFe2As2的自旋激发。通过比较观察到的光谱与理论计算，我们得出结论，自旋激发可以很好地描述了巡回模型时，考虑到适度的电子相关效应。
Understanding magnetic interactions in the parent compounds of high-temperature superconductors forms the basis for determining their role for the mechanism of superconductivity. For parent compounds of iron pnictide superconductors such as AFe(2)As(2) (A = Ba, Ca, Sr), although spin excitations have been mapped out throughout the entire Brillouin zone, the respective measurements were carried out on twinned samples and did not allow for a conclusive determination of the spin dynamics. Here we use inelastic neutron scattering to completely map out spin excitations of similar to 100% detwinned BaFe2As2. By comparing observed spectra with theoretical calculations, we conclude that the spin excitations can be well described by an itinerant model when taking into account moderate electronic correlation effects.