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Electronic Structure of Ti 2 O 3 from Single Crystal Thermoreflectance Spectroscopy
Author(s) -
Bianconi A.,
Stizza S.,
Bernardini R.,
Nannarone S.
Publication year - 1979
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.2220930235
Subject(s) - single crystal , semiconductor , materials science , plasmon , spectroscopy , spectral line , crystal (programming language) , electron , transition metal , atomic electron transition , excitation , atomic physics , molecular physics , chemistry , optoelectronics , crystallography , physics , programming language , catalysis , quantum mechanics , computer science , biochemistry , astronomy
For the first time studies are made of the polarized thermoreflectance of an oriented Ti 2 O 3 single crystal. The spectra in the photon energy range 1 to 3.5 eV are taken at room and liquid nitrogen temperature. Optical transitions involving the 3d electrons, which play a crucial role in the semiconductor‐to‐metal transition, are studied. The optical transition at 2.9 eV is identified as a transition at a M 2 critical point by Kramers‐Kronig analysis of the thermoreflectance spectra. A clear evidence of a plasmon excitation at 1.82 eV in the semiconducting Ti 2 O 3 is reported. The temperature shift of the bands is in agreement with the band‐crossing model of the semiconductor‐to‐metal phase transition.