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The Optical Properties of MnAs and MnAs 0.85 P 0.15
Author(s) -
Bärner K.,
Braunstein R.,
Chock E.
Publication year - 1977
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.2220800206
Subject(s) - antibonding molecular orbital , condensed matter physics , density of states , fermi level , orthorhombic crystal system , band gap , electronic band structure , lattice constant , electron , materials science , atomic physics , chemistry , crystal structure , crystallography , physics , quantum mechanics , diffraction , atomic orbital , optics
The reflectivity spectra of MnAs (hexagonal NiAs structure) and MnAs 0.85 P 0.15 (orthorhombic lattice) are measured in the energy range 0.3 to 14 eV at room temperature and a Kramers‐Kronig analysis is performed. It is found that below 1 eV plasma effects due to free d‐electrons dominate. At energies from 3 to 8 eV plasma resonances due to bound d‐electrons are observed. In the intermediate region, the imaginary part of the dielectric constant ϵ 2 reveals structure due to transitions between d‐states and from the valence band into d‐ and sp states. Analysis of the combined density‐of‐states function ϵ 2 E 2 yields 3.0 eV for the energy gap between bonding and antibonding sp states for both compounds. Also, from interpretation of ϵ 2 together with ϵ 2 E 2 the energy separation between the Fermi level E F and the bottom of the minority spin e‐band and the distance of the valence band edge from E F are obtained.