Abstract
Terahertz (THz) transmission spectra have been measured as a function of temperature and magnetic field on single crystals of Cu${}_{3}$Bi(SeO${}_{3}$)${}_{2}$O${}_{2}$Br. In time-domain THz spectra without magnetic field, two resonance absorptions are observed below the magnetic ordering temperature ${T}_{N}\ensuremath{\sim}27.4$ K. The corresponding resonance frequencies increase with decreasing temperature and reach energies of 1.28 and 1.23 meV at 3.5 K. Multifrequency electron spin resonance transmission spectra as a function of the applied magnetic field show the field dependence of four magnetic resonance modes, which can be modeled as a ferromagnetic resonance including demagnetization and anisotropy effects.
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