Theory of magnetic excitations in iron-based layered superconductors

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dc.creatorKorshunov, M. M.
dc.creatorEremin, I.
dc.date2008-04-10
dc.date2008-10-26
dc.date.accessioned2026-07-07T10:12:52Z
dc.date.available2026-07-07T10:12:52Z
dc.descriptionBased on the effective four-band model we analyze the spin response in the normal and superconducting states of the Fe-pnictide superconductors. While the normal state spin excitations are dominated by the continuum of the interorbital antiferromagnetic fluctuations and the intraband spin density wave fluctuations, the unconventional superconductivity yields different feedback. The resonance peak in form of the well-defined spin exciton occurs {\it only} for the interband scattering at the antiferromagnetic momentum ${\bf Q}_{AFM}$ for the $s_\pm$ (extended s-wave) superconducting order parameter and it disappears rapidly for ${\bf q} < {\bf Q}_{AFM}$. The resonance feature is extremely weak for the $d_{x^2 -y^2}$-wave order parameter due to specific Fermi surface topology of these compounds. The essential difference between $s_\pm$-wave and $d_{x^2 -y^2}$-wave symmetries for the magnetic excitations can be used for experimental determination of the superconducting wave function symmetry.
dc.description5 pages, 3 figures, published version
dc.identifierhttps://arxiv.org/abs/0804.1793
dc.identifierhttp://arxiv.org/abs/0804.1793
dc.identifierPhys. Rev. B 78, 140509(R) (2008)
dc.identifierdoi:10.1103/PhysRevB.78.140509
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172334
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleTheory of magnetic excitations in iron-based layered superconductors
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