Spin-Orbit Coupling and Magnetic Anisotropy in Iron-Based Superconductors
Daniel D. Scherer, Brian M. Andersen
DOI 10.1103/PhysRevLett.121.037205 · Physical Review Letters
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Abstract
We determine theoretically the effect of spin-orbit coupling on the magnetic excitation spectrum of itinerant multiorbital systems, with specific application to iron-based superconductors. Our microscopic model includes a realistic ten-band kinetic Hamiltonian, atomic spin-orbit coupling, and multiorbital Hubbard interactions. Our results highlight the remarkable variability of the resulting magnetic anisotropy despite constant spin-orbit coupling. At the same time, the magnetic anisotropy exhibits robust universal behavior upon changes in the band structure corresponding to different materials of iron-based superconductors. A natural explanation of the observed universality emerges when considering optimal nesting as a resonance phenomenon. Our theory is also of relevance to other itinerant systems with spin-orbit coupling and nesting tendencies in the band structure.
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