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

High-temperature correlated spin dynamics in FeSi from Si-29 NMR relaxation

CORTI, MAURIZIO ENRICO;
2004

Abstract

29Si NMR measurements in FeSi up to 900K are reported. Below 350K the spin-lattice relaxation rate and the Knight shift (KS) display behaviors typical of gapped systems and track the homogeneous static susceptibility. In the high temperature range an unexpected effect is observed with static susceptibility and KS leveling around 500K and then decreasing, while relaxation rate 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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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11571/105243
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