Theory of magnetic excitations in iron-based layered superconductors
M. M. Korshunov, I. Eremin
DOI 10.1103/PhysRevB.78.140509 · Physical Review B
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Abstract
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 the form of the well-defined spin exciton occurs only for the interband scattering at the antiferromagnetic momentum QAFM for the s± (extended s wave) superconducting order parameter and it disappears rapidly for q<QAFM. The resonance feature is extremely weak for the dx2−y2-wave order parameter due to the specific Fermi-surface topology of these compounds. The essential difference between s±-wave and dx2−y2-wave symmetries for the magnetic excitations can be used for experimental determination of the superconducting wave-function symmetry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaNiPO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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