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The 2008 discovery of superconducting ferropnictides with Tc~26K-56Kintroduced a new family of materials into the category of high Tcsuperconductors. The ongoing project of understanding the superconductingmechanism and pairing symmetry has already revealed a complicated and oftencontradictory underlying picture of the structural and magnetic properties.There is an almost unprecedented sensitivity of the calculated magnetism andFermi surface to structural details that prohibits correspondence withexperiment. Furthermore, experimental probes of the order parameter symmetryare in surprisingly strong disagreement, even considering the relativeimmaturity of the field. Here we outline all of the various and seeminglycontradictory evidences, both theoretical and experimental, and show that theycan be rectified if the system is assumed to be highly magnetic with a spindensity wave that is well-defined but with magnetic twin and anti-phaseboundaries that are dynamic on the time-scale of experiments. Under thisassumption, we find that our calculations can accurately reproduce even veryfine details of the structure, and a natural explanation for the temperatureseparation of structural and magnetic transitions is provided. Thus, our theoryrestores agreement between experiment and theory in crucial areas, makingfurther cooperative progress possible on both fronts. We believe thatfluctuating magnetic domains will be an essential component of unravelling theinterplay between magnetic interactions and superconductivity in these newesthigh Tc superconductors.

A key role for unusual spin dynamics in ferropnictides