Abstract
High-temperaturesuperconductivityintheiron-basedmaterialsemergesfrom,orsometimescoexistswith,theirmetallicorinsulatingparentcompoundstates.Thisissurprising,astheseundopedstatesexhibitdramaticallydifferentantiferromagneticspinarrangementsandNéeltemperatures.Althoughthereisageneralconsensusthatmagneticinteractionsareimportantforsuperconductivity,muchremainsunknownconcerningthemicroscopicoriginofthemagneticstates.Inthisreview,wesummarizetheprogressinthisarea,focusingonrecentexperimentalandtheoreticalresults,andtheirmicroscopicimplications.WeconcludethattheparentcompoundsareinastatethatismorecomplexthanthatimpliedbyasimpleFermisurfacenestingscenario,andadualdescriptionincludingbothitinerantandlocalizeddegreesoffreedomisneededtoproperlydescribethesefascinatingmaterials.
