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Spectroscopic ellipsometric studies of the dielectric function of Cd 1− x − y Mn x Fe y Te single crystals
Author(s) -
Hwang Younghun,
Kim Hyekyeong,
Um Youngho,
Park Hyoyeol
Publication year - 2004
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.200304648
Subject(s) - valence (chemistry) , photon energy , dielectric function , analytical chemistry (journal) , dielectric , spectral line , ellipsometry , chemistry , atmospheric temperature range , materials science , crystallography , optics , photon , thin film , physics , thermodynamics , nanotechnology , optoelectronics , organic chemistry , chromatography , astronomy
Cd 1− x − y Mn x Fe y Te single crystals grown by the vertical Bridgman method have been studied by measuring the complex dielectric function using spectroscopic ellipsometry in the 1.5 ∼ 5.5 eV photon energy range at room temperature. The CP energy parameters of the E 0 , E 1 , E 1 + Δ 1 , and E 2 structures were determined by fitting the second‐derivative spectra ( d 2 ε /d ω 2 ) with a theoretical model, i.e., the standard critical point (SCP) line shapes. The E 1 , E 1 + Δ 1 , and E 2 energies decreased with increasing Fe composition y , which is due to the hybridization effect of the valence and conduction bands in Cd 1− x Mn x Te with Fe 3 d levels. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)