An optical analysis reveals that the electronic correlations in the 'parent' compounds of the iron pnictide superconductors are sufficiently strong to significantly impede the mobility of the electrons.
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Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2
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Si, Q. Electrons on the verge. Nature Phys 5, 629–630 (2009). https://doi.org/10.1038/nphys1394
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DOI: https://doi.org/10.1038/nphys1394
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