CRYSTAL-STRUCTURE AND RAMAN-SCATTERING IN ZN1-XMGXSE ALLOYS

Citation
Dm. Huang et al., CRYSTAL-STRUCTURE AND RAMAN-SCATTERING IN ZN1-XMGXSE ALLOYS, Applied physics letters, 67(24), 1995, pp. 3611-3613
Citations number
12
Categorie Soggetti
Physics, Applied
Journal title
ISSN journal
00036951
Volume
67
Issue
24
Year of publication
1995
Pages
3611 - 3613
Database
ISI
SICI code
0003-6951(1995)67:24<3611:CARIZA>2.0.ZU;2-9
Abstract
Zn1-xMgxSe alloys have been grown on (100) GaAs substrates by molecula r beam epitaxy. Their crystal structures are determined form x-ray dif fraction spectra and are found to be zinc blende, rocksalt, and their mixture for x<0.5, x=1, and x similar to 0.6, respectively. The Raman spectra are measured and show two-mode behavior for those alloys with zinc blende structure. The long-wavelength frequencies of ZnSe- and Mg Se-like optical phonons are determined and the results can be expresse d as linear functions of x. The first-order Raman spectra are observed for MgSe and Mg-rich Zn1-xMgxSe alloys with rocksalt structure. Those Raman spectra are attributed to the scattering from optical phonons a ctivated by disorders and impurities, and their line shapes represent the phonon density of states. (C) 1995 American Institute of Physics.