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Reflectivity Spectra of YBa 2 Cu 3 O 7− x in the 0.6 to 6.1 eV Range Evidence for Excitonic Absorption
Author(s) -
Nag A.,
Neogy C.,
Ghosh B.,
Joarder R.,
Deb S. K.
Publication year - 1992
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/pssb.2221690126
Subject(s) - reflectivity , spectral line , exciton , analytical chemistry (journal) , range (aeronautics) , absorption (acoustics) , absorption spectroscopy , atomic physics , materials science , chemistry , physics , condensed matter physics , optics , chromatography , composite material , astronomy
Reflectance measurements at room temperature (298 K) on ceramic YBa 2 Cu 3 O 7− x in the spectral range 0.6 to 6.1 eV and subsequent Kramers‐Kronig analyses of the spectra indicate the presence of excitations at 1.0, 2.1, 3.6, and 5.7 eV. It is argued that there is enough evidence to consider the 1.0 and 2.1 eV excitations as excitons.