Percolation behavior in the Raman spectra of ZnBeTe alloy

Page`s, O.; Tite, T.; Bormann, D.; Maksimov, O.; Tamargo, M. C.
April 2002
Applied Physics Letters;4/29/2002, Vol. 80 Issue 17, p3081
Academic Journal
Zone-center longitudinal (LO) and transverse (TO) optical phonons of Zn[sub 1-x]Be[sub x]Te epilayers are identified by Raman spectroscopy. On top of the expected BeTe- and ZnTe-like modes, which obey the modified-random-element-isodisplacement model, we observe an extra BeTe-like (TO, LO) doublet at intermediate x values. It has the same atypical characteristics as its BeSe-like counterpart in ZnBeSe alloy. Its activation validates our percolative picture for multimode description in Be–chalcogenide alloys that open the attractive class of mixed crystals with a sharp contrast in the bond stiffness. Also, the local modes of Be in ZnTe and of Zn in BeTe are identified at 411 cm-1 and 195 cm-1, respectively. © 2002 American Institute of Physics.


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