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Urbach Rule in PbWO 4
Author(s) -
Itoh M.,
Yokota H.,
Horimoto M.,
Fujita M.,
Usuki Y.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200206)231:2<595::aid-pssb595>3.0.co;2-w
Subject(s) - range (aeronautics) , condensed matter physics , attenuation coefficient , phonon , absorption (acoustics) , materials science , physics , optics , computational physics , composite material
The fundamental absorption tail of single PbWO 4 crystals has been investigated in the temperature range of 6–300 K. The absorption coefficient in the tail region is found to obey the Urbach rule, with the steepness parameter σ 0 = 0.82 and the effective phonon energy ħω = 32 meV. The present results are discussed in terms of the Sumi and Toyozawa theory on Urbach edges, indicating that they are consistent with other experimental results.