Theory of magnetic excitations in iron-based layered superconductors
By M. Korshunov, I. Eremin. 2008
186 citations recorded by the source corpus.
Based 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.
Subfields: Accounting, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/86ba9a086307b9c0ba974aec7dd0793884bf03c8
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Citations in the corpus
- Normal-state spin dynamics and temperature-dependent spin-resonance energy in optimally doped BaFe 1.85 Co 0.15 As 2 (2009, methodology): “3)∆ is in good agreement with the predictions for a sign-reversed s±-wave gap [17, 18].”
- Magnetism and its microscopic origin in iron-based high-temperature superconductors (2012, background): “One of the consequences of this superconducting state is that the imaginary part of the dynamic susceptibility, χ(Q,ω) should have a sharp peak, termed spin resonance in copper oxide superconductors [26], at QAF = (1, 0) below Tc [27, 28].”