Abstract
29Si NMR measurements in FeSi up to 900 K are reported. For T⩽350 K the spin-lattice relaxation rate T 1 −1 and the Knight shift K S display behaviors typical of gapped systems and track the homogeneous static susceptibility χ( T). In the high temperature range an unexpected effect is observed with χ( T) and K S leveling around 500 K and then decreasing, while T 1 −1 continues to increase up to 900 K. Insights on the spin dynamics of Fermi-like carriers in strong correlation are derived.
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