Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.42: Poster
Thursday, March 29, 2012, 15:00–19:00, Poster B
Low-temperature high-pressure optical investigation of the Mott-Hubbard insulator TiOCl — •Jihaan Ebad-Allah1, Matthias Klemm1, Siegried Horn1, Michael Sing2, Ralph Claessen2, and Christine Kuntscher1 — 1Experimentalphysik II, Universität Augsburg, 86159 Augsburg, Germany — 2Experimentelle Physik 4, Universität Würzburg, D-97074 Würzburg, Germany
The titanium oxyhalides TiOX (with X=Cl or Br) are Mott-Hubbard
insulators with a charge gap of ≈ 2 eV. Our recent
pressure-dependent infrared spectroscopic investigations on TiOX at room temperature [1]
suggested that the application of external pressure induces an
insulator-to-metal transition. As a follow-up,
we studied the infrared transmittance and reflectance spectra of TiOCl at
temperatures from 300 K down to 50 K and for pressures up to 22 GPa.
Above 14 GPa a huge growth of spectral weight is observed in the optical conductivity
spectrum. Furthermore, we determined the temperature and pressure dependence of the crystal field
splitting via the frequency of the orbital excitation.
C. A. Kuntscher et al., Eur. Phys. J. Special Topics 180, 29 (2010).