Polarization dependence of the fundamental absorption edge and the Urbach rule in PbMoO4 crystals
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This is the pre-peer reviewed version of the following article: Fujita M. and Itoh. M. Polarization dependence of the fundamental absorption edge and the Urbach rule in PbMoO4 crystals. physica status solidi (b). 247(9), 2240-2243, 2010, which hasbeen published in final form at http://dx.doi.org/10.1002/pssb.201046034The fundamental absorption tail of PbMoO4 crystals has been investigated in the ac plane in a wide temperature range between 6 and 300 K by using linearly polarized light. A remarkable dichroism between E//a and E//c is observed in the tail region. A defect-related absorption band is clarified for the polarization E//a. It is found that the Urbach rule holds for the absorption spectra measured with light polarized with E//c. The results of the analysis of the Urbach tail are discussed in comparison with the experimental results on the exciton transition and luminescence properties in this material.
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