In study of iron based superconductors, one of the starting point is that electrons are weakly interacting(or weakly correlated) such that we can still apply many body perturbation theory(so called weak coupling scenario by A.Chubukov, for instance). According to them, nesting give rises to SDW(itinerant) and superconductivity appears by doping from SDW. More importantly, superconducting interaction between cooper pair is mediated by so called "spin fluctuation", the collective bosonic degrees of freedom. Can anyone give more clear and simple picture for spin fluctuation?

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  • $\begingroup$ In general, I believe that the key to understand these fluctuations, is to have an insight into how fluctuation-dissipation theorem works and how excitations determine ground state correlation. Unfortunately, I do not know anything about pnictides, so I will have to eagerly wait detailed answer to this question. $\endgroup$ – Mikael Kuisma Jul 30 '16 at 13:18
  • $\begingroup$ @Giovanni, do you have a more specific question in mind? Are you asking what spin fluctuations are? Or how they arise in pnictides in particular? Or how they give rise to superconductivity? $\endgroup$ – leongz Sep 1 '16 at 2:23

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