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NMR study of Bi0.5Sb1.5Te3 (a TI) and ZnTe (a non-TI) materials. NMR response of the Bi0.5Sb1.5Te3 reveals negative Knight shift as the crystallite size (A) and temperature decreases (B), whereas the frequency shift of ZnTe (C) remains constant at −875.05 ppm even when the crystallite size is reduced to the nanoscale (after a ball-milling process lasting 180 min).
