NMR in Magnetite below and around the Verwey transition

NMR on 57Fe nuclei was measured in two single crystals of magnetite between 4.2 and 135 K (temperature of the Verwey transition TV=121.5 and 123.9 K). We were able to register all lines detected at 4.2 K also at higher temperatures up to TV. The spectra are compatible with the space group Cc, which predicts 8 and 16 lines for iron on tetrahedral (A) and octahedral (B) sites, respectively. One of the Fe(A) lines is doubly degenerate for all T