Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2
Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2
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SrCo2As2 中铁磁和条状反铁磁自旋涨落的共存
DOI：
10.1103/physrevlett.122.117204
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发表时间：
2019
影响因子：
8.6
通讯作者：
Dai Pengcheng
中科院分区：
文献类型：
--
作者：
Li Yu;Yin Zhiping;Liu Zhonghao;Wang Weiyi;Xu Zhuang;Song Yu;Tian Long;Huang Yaobo;Shen Dawei;Abernathy D. L.;Niedziela J. L.;Ewings R. A.;Perring T. G.;Pajerowski Daniel M.;Matsuda Masaaki;Bourges Philippe;Mechthild Enderle;Su Yixi;Dai Pengcheng
我们用非弹性中子散射研究了铁铅酸铅超导体中自旋涨落的能量和波矢关系。我们的数据揭示了反铁磁(AF)和铁磁(FM)自旋涨落分别在波矢和波矢上共存。通过将中子散射结果与动态平均场理论计算和角分辨光电子能谱实验结果进行比较，我们得出结论：AF和FM自旋涨落都与费米能级附近的理论轨道平带密切相关，这与超导中的理论轨道不同。因此，Co取代引起了全轨道跃迁，并导致了不利于单线态对超导电性的FM自旋起伏。
We use inelastic neutron scattering to study energy and wave vector dependence of spin fluctuations in, derived fromiron pnictide superconductors. Our data reveal the coexistence of antiferromagnetic (AF) and ferromagnetic (FM) spin fluctuations at wave vectorsand, respectively. By comparing neutron scattering results with those of dynamic mean field theory calculation and angle-resolved photoemission spectroscopy experiments, we conclude that both AF and FM spin fluctuations inare closely associated with a flatband of theorbitals near the Fermi level, different from theorbitals in superconducting. Therefore, Co substitution ininduces atoorbital switching, and is responsible for FM spin fluctuations detrimental to the singlet pairing superconductivity.