Percolation scenario for hexagonal semiconductor alloys : A test case by applying inelastic neutron scattering to wurtzite-Zn0.67Mg0.33S
The A1-xBxC semiconductor alloys are like geometrical objects and thus ideal to study experimentally the A¿B substitution, which relates to the percolation theory. For doing so one needs a local probe, such as the bond force constant (k) addressed by vibrational spectroscopies. Our pioneering studies of the phonon and phonon-polariton dispersions of cubic-Zn1 xBexSe combining inelastic neutron (INS) and light (Raman, RS) scattering revealed a k-sensitivity to the local (A- or B-like) environment across the Brillouin zone. This was formalized via our percolation model (PM) deviating from the historical MREI (modified random element isodisplacement) model, by construction blind to the local environment. Our aim in this work is to test how the PM transfers to a less-symmetrical system based on an exhaustive study of its phonon dispersion curves by INS, using hexagonal-Zn1 xMgxS (x=0.33) as a case study. In parallel, its phonon-polariton dispersion will be studied by (forward) RS to complete an overview of the Zn1 xMgxS lattice dynamics, yet unexplored experimentally
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RAO MALA; ALHADDAD Toni; ELMAHJOUBI Abdelmajid; GOEL Prabhatasree; IVANOV Alexandre; MINA Mayssoune; Olivier Pagès; POLIAN Alain and Andrei V. Postnikov. (2023). Percolation scenario for hexagonal semiconductor alloys : A test case by applying inelastic neutron scattering to wurtzite-Zn0.67Mg0.33S. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-598
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