Studies of frequency pulling effects in the quasi-two-dimensional ferromagnet, manganese acetate tetrahydrate

Abstract Both the abundant, host 55 Mn spins and very dilute, doped 54 Mn spins in the quasi-two-dimensional system, manganese acetate tetrahydrate, have been studied by NMR-thermally detected by nuclear orientation and NMR on oriented nuclei, respectively. The 55 Mn spins interact via the indirect, strong Suhl–Nakamura interaction causing NMR frequency pulling. The temperature dependence of this effect was measured for both the Mn1 and Mn2 ions in the crystal. The spectra show a structure not predicted by theory.