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A 23 Na (I=32) NMR study is presented on the itinerant ferromagnets NaFe 4 Sb 12 and the isostructural Ca-substituted compound Na 0.5 Ca 0.5 Fe 4 Sb 12 performed in 7.05 and 11.74T in the temperature range from 4 to 300K. Both compounds show a bulk ferromagnetism below 85K. Static (Knight-shift) and dynamic (spin-lattice relaxation) measurements...
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