Journal of Physics and Chemistry of Solids vol:46 issue:12 pages:1387-1393
A low-temperature FIR spectrometer was used for measuring EPR of LiHoF4 in the field range 0–7 T, frequency range 150–1600 GHz. Zero field splittings and g-values for the lowest four energy levels are presented. Two sets of hyperfine lines were observed, corresponding to ΔmN = 0 and ΔmN = −1. The exchange part of the molecular field constant is determined and compared to results from previous experiments.