Paramagnon in a KxFe2-ySe2 superconductor
A recent time-of-flight experiment on a superconducting KxFe2-ySe2 sample revealed not only spin resonance mode at 14 meV around the (0.5,0.25,0) wave vector, but also a ring-like low energy (LE) mode at 9 meV which connects the equivalent resonance positions in the HK0 scattering plane. This feature does not show a temperature dependence upon entering the superconducting state. We suspect that this new excitation is a paramagnon resulting from the nesting of the electron pockets at M point. In order to confirm its magnetic character we propose to study its temperature dependence in the normal state and its dispersion with the out-of-plane wave vector.
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FRIEMEL Gerd; Dmytro Inosov; IVANOV Alexandre; JANG Hoyoung; KEIMER Bernhard; NASSAR Roy; J. T. Park; PIOVANO Andrea and PORRAS PEREZ GUERRERO Juan Pablo. (2012). Paramagnon in a KxFe2-ySe2 superconductor. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1206
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