• Medientyp: E-Artikel
  • Titel: Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo$_2$As$_2$
  • Beteiligte: Li, Yu [Verfasser:in]; Yin, Zhiping [Verfasser:in]; Niedziela, J. L. [Verfasser:in]; Ewings, R. A. [Verfasser:in]; Perring, T. G. [Verfasser:in]; Pajerowski, Daniel M. [Verfasser:in]; Matsuda, Masaaki [Verfasser:in]; Bourges, Philippe [Verfasser:in]; Mechthild, Enderle [Verfasser:in]; Su, Yixi [Verfasser:in]; Dai, Pengcheng [Verfasser:in]; Liu, Zhonghao [Verfasser:in]; Wang, Weiyi [Verfasser:in]; Xu, Zhuang [Verfasser:in]; Song, Yu [Verfasser:in]; Tian, Long [Verfasser:in]; Huang, Yaobo [Verfasser:in]; Shen, Dawei [Verfasser:in]; Abernathy, D. L. [Verfasser:in]
  • Erschienen: APS, 2019
  • Erschienen in: Physical review letters 122(11), 117204 (2019). doi:10.1103/PhysRevLett.122.117204
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevLett.122.117204
  • ISSN: 0031-9007; 1079-7114; 1092-0145
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  • Beschreibung: We use inelastic neutron scattering to study energy and wave vector dependence of spin fluctuations in SrCo2As2, derived from SrFe2−xCoxAs2 iron pnictide superconductors. Our data reveal the coexistence of antiferromagnetic (AF) and ferromagnetic (FM) spin fluctuations at wave vectors QAF=(1,0) and QFM=(0,0)/(2,0), 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 in SrCo2As2 are closely associated with a flatband of the eg orbitals near the Fermi level, different from the t2g orbitals in superconducting SrFe2−xCoxAs2. Therefore, Co substitution in SrFe2−xCoxAs2 induces a t2g to eg orbital switching, and is responsible for FM spin fluctuations detrimental to the singlet pairing superconductivity.
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