Spin-Orbit Interactions and the Nematicity Observed in the Fe-Based Superconductors

P. D. Johnson; H.-B. Yang; J. D. Rameau; G. D. Gu; Z.-H. Pan; T. Valla; M. Weinert; A. V. Fedorov

doi:10.1103/PhysRevLett.114.167001

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Spin-Orbit Interactions and the Nematicity Observed in the Fe-Based Superconductors

P. D. Johnson, H.-B. Yang, J. D. Rameau, G. D. Gu, Z.-H. Pan, T. Valla, M. Weinert, A. V. Fedorov

DOI 10.1103/PhysRevLett.114.167001 · Physical Review Letters

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
FeTe0.5Se0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure not reported	unknown
KFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown