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Temperature behavior of dielectric function spectra and optical transitions in TlGaS 2
Author(s) -
Shim YongGu,
Kawabata Toshiyuki,
Wakita Kazuki,
Mamedov Nazim
Publication year - 2015
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.201400342
Subject(s) - dielectric , spectral line , dielectric function , atmospheric temperature range , materials science , range (aeronautics) , phase transition , condensed matter physics , photon energy , molecular physics , atomic physics , chemistry , optics , photon , physics , optoelectronics , thermodynamics , astronomy , composite material
The dielectric function spectra of TlGaS 2 crystal with quasi‐two‐dimensional layered structure have been studied by means of spectroscopic elipsometry over the photon range 1.5–6.0 eV in the temperature range 100–400 K. The absolute values of the dielectric function show a sudden temperature‐induced change around 180 and 280 K. The energy of the inter‐band optical transitions retrieved from the dielectric function spectra display an abrupt temperature change around the same temperatures. Structural phase transitions are behind the observed change of electronic band structure of TlGaS 2 .