Abstract
For BaPbxBi1-xO3, we have found a long-tail absorption with a square-root spectral shape which is consistent with a picture of the indirect allowed exciton. The exciton consists of an electron and a hole at either side of an indirect gap formed by the three-dimensional CDW. The indirect-gap energy deduced from the analyses nearly coincides with twice of the activation energy of the electronic transport. The exciton binding energy is found to be comparable with the band gap for a nearly stoichiometric BaBi03, indicating that possible Bose condensation of thermal excitons might be related to the enormous density of states which contributes to transport phenomena In BaPbxBi1-xO3, the deduced indirect gap energy once increases and then decreases with the Pb substitution, indicating formation of the Pb 6s band above the band gap with increasing the band width to merge into the lower Bi-6s band at the metal insulator transition.
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Uwe, H. (1997). Spectroscopic Study of a 3d Peierls Insulator in BaBiO3 . In: Nasu, K. (eds) Relaxations of Excited States and Photo-Induced Structural Phase Transitions. Springer Series in Solid-State Sciences, vol 124. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60702-8_6
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DOI: https://doi.org/10.1007/978-3-642-60702-8_6
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