Atomic-resolution imaging of a strongly inhomogeneous superfluid in an iron-based superconductor shows spatial correlation between superfluid density variations and the strength of quasiparticle character.
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Acknowledgements We acknowledge J. C. Davis, S. D. Edkins, M. H. Fischer, K. J. Franke, H. Grabert, M. H. Hamidian, K. Heeck, M. Leeuwenhoek, D. K. Morr, M. T. Randeria, G. Verdoes and J. Zaanen for discussions. This work was supported by the European Research Council (ERC StG SpinMelt) and by the Netherlands Organization for Scientific Research (NWO/OCW), as part of the Frontiers of Nanoscience programme, as well as through a Vidi grant (680-47-536). G.D.G. is supported by the Office of Basic Energy Sciences, Materials Sciences and Engineering Division, US Department of Energy (DOE) under contract number de-sc0012704.
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