Hyperfine interactions of 155Gd and 157Gd in gadolinium iron garnet

NMR on a gadolinium iron garnet was measured in zero and nonzero external magnetic field at 4.2 K. 24 well separated lines of 155Gd and 157Gd nuclei were found in the zero field spectrum. From the spectral line positions we determined the EFG tensor and both isotropic and anisotropic components of hyperfine magnetic interaction on gadolinium nuclei. The experimental hyperfine interaction parameters were compared with the 'ab initio' calculations of the EFG tensor