THz spectroscopy in the pseudo-Kagome system Cu3Bi(SeO3)2O2Br
Zhe Wang, M. Schmidt, Y. Goncharov, V. Tsurkan, H.-A. Krug von Nidda,, A. Loidl, and J. Deisenhofer
TL;DR
This study investigates the terahertz spectral properties of Cu3Bi(SeO3)2O2Br, revealing magnetic resonances and their temperature and magnetic field dependence, providing insights into its magnetic excitations.
Contribution
It presents the first detailed THz spectroscopy analysis of Cu3Bi(SeO3)2O2Br, identifying magnetic resonance modes and their behavior under varying temperature and magnetic field conditions.
Findings
Resonance absorptions observed below T_N~27.4 K
Resonance frequencies increase as temperature decreases
Magnetic field dependence of four resonance modes modeled as ferromagnetic resonance
Abstract
Terahertz (THz) transmission spectra have been measured as function of temperature and magnetic field on single crystals of Cu3Bi(SeO3)2O2Br. In the time-domain THz spectra without magnetic field, two resonance absorptions are observed below the magnetic ordering temperature T_N~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. Multi-frequency electron spin resonance transmission spectra as a function of 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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