NMR of 57Fe below and around the Verwey transition in Al-substituted magnetite

Temp. dependence of 57Fe NMR spectra was measured below and around the Verwey transition in Fe3-xAlxO4 (x = 0, 0.005, 0.01, 0.02, 0.03) single crystals. All lines of substituted samples were broadened with increasing Al concn., but the authors found no change in their positions. The Verwey temp. TV decreases with increasing Al concn. in agreement with elec. cond. measurements. The satellite structure found in the vicinity of the A-line above TV disappears below TV, however, a broad spectrum in the spectral region 35-45 MHz at temp. 4.2 K was detected. [on SciFinder (R)]