2015/04/23 by P. D. Johnson, H. -B. Yang, Haibo Yang +9
Materials Science · Physics and Astronomy · #Aerospace engineering #Condensed matter physics #Iron-based superconductors research #Orbit (dynamics) #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Spin (aerodynamics) #Spin–orbit interaction #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.114.167001
published as Phys. Rev. Lett. 114, 167001 (2015) · 11 pages, 4 figures, 20 references
openalex publication_date 2015/04/23 · arxiv created 2016/06/11 · arxiv updated 2016/06/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
High-resolution angle-resolved photoelectron spectroscopy is used to examine the electronic band structure of FeTe0.5Se0.5 near the Brillouin zone center. A consistent separation of the α1 and α2 bands is observed with little kz dependence of the α1 band. First-principles calculations for bulk and thin films demonstrate that the antiferromagnetic coupling between the Fe atoms and hybridization-induced spin-orbit effects lifts the degeneracy of the Fe dxz and dyz orbitals at the zone center leading to orbital ordering. These experimental and computational results provide a natural microscopic basis for the nematicity observed in the Fe-based superconductors.