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Temperature dependence of r and d r /d T for the SmFeAsO 1 – x F x and Ba 1 – x K x Fe 2 As 2 samples isotopically substituted with 56 Fe and 54 Fe. RH Liu et al. Nature 459 , 64-67 (2009) doi:10.1038/nature0 7981.
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Temperature dependence of r and dr/dT for the SmFeAsO1 – xFx and Ba1 – xKxFe2As2 samples isotopically substituted with 56Fe and 54Fe. RH Liu et al.Nature459, 64-67 (2009) doi:10.1038/nature07981