Mid-gap states in BaBiO3: A photo-induced reflectance study



W. Markowitschb,a, V. Schlosserb,a, W. Langb,a, K. Remschnigc, P. Roglc

  1. Ludwig Boltzmann Institut für Festkörperphysik, Kopernikusgasse 15, A-1060, Wien, Austria

  2. Institut für Festkörperphysik der Universität Wien, Austria

  3. Institut für Physikalische Chemie, Universität Wien, Austria




ABSTRACT: Photo-induced reflectance measurements of BaBiO3 are reported. Utilizing a double modulation technique, several reflectivity peaks around the midgap energy (approx. 0.9 eV) are observed when exciting the system at a photon energy of 1.95 eV. This is evidence for a lattice relaxation after removing electrons from the valence band. As a consequence energy levels appear within the gap. The results confirm that the gap in BaBiO3 originates from a Peierls distortion (charge density wave).

DOI: doi:10.1016/0921-4534(91)91721-F

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