Iron-based superconductor is a class of high-$T_c$ superconductors discovered in 2008.
Are there any review papers about these superconductors yet? If not, which are the key papers in the field?
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For specific recommendations, the review in Nature by Paglione and Greene is very highly cited and accessible. There is a review of the magnetic properties by Lumsden and Christianson and a somewhat older article is available from Hosono and collaborators. A Nature review on the debate over the pairing mechanism is available from Mazin
10.1103/RevModPhys.83.1589: A comprehensive review in Dec 2011 by G. R. Stewart containing a myriad of key experimental and theoretical results.