Observations on the Resonant Mode in Superconducting KxFe2-ySe2

Joshua Lim, Rieko Morisaki-Ishii, Louis Lemberger, L-P Regnault, Y. Takano, H. Takeya, Elizabeth Blackburn, Hazuki Kawano-Furukawa

Research output: Contribution to journalArticlepeer-review


We have observed the magnetic resonant mode in the superconducting state of the ironbased superconductor KxFe2􀀀ySe2. It is centred at 12:7 _ 0:2 meV at Q = (0.25, 0.5, 0.5), using the unfolded Fe-sublattice scheme. By studying the temperature dependence of the resonance, we have shown that the mode is linked to the superconducting state and has an associated change in the low energy spectral weight at Tc. Despite the resonance meeting a well defined nesting condition that indicates a superconductor with homogeneous phase, it appears the resonance does not disappear sharply at Tc, unlike in the analogous iron arsenide superconductors.
Original languageEnglish
Article number017023
JournalJPS Conference Proceedings
Publication statusPublished - 16 Jun 2014


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