Terahertz spectroscopy in the pseudo-Kagome system Cu3Bi(SeO3)2O2Br

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, J. Deisenhofer

(Submitted on 4 Oct 2012 (v1), last revised 13 Nov 2012 (this version, v2))

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.

View full article http://arxiv.org/pdf/1210.1343v2.pdf

.......Time-domain THz transmission measurements were carried out on a 2 × 2 × 0.3 mm3 single crystal for 3.5 K <T < 300 K using a TPS spectra 3000 spectrometer with f/2 focusing optics (TeraView, Ltd.). ...

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