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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Pressure-induced phonon freezing in the Zn
1-x
Be
x
Se alloy: A study via the percolation model
Physical Review B - Condensed Matter and Materials Physics, Volume 81, No. 11, Article 115207, Year 2010
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Description
We use the 1-bond→2-phonon percolation doublet of zinc-blende alloys as a "mesoscope" for an unusual insight into their phonon mode behavior under pressure. We focus on (Zn,Be)Se and show by Raman scattering that the application of pressure disables an anharmonic coupling between the nominal Zn-Se zone-center TO mode and disorder-activated two-phonon zone-edge continua. This reveals an unexpectedly clear percolation-type fine structure of the Zn-Se TO mode, the latter fine structure being unaffected by pressure. In contrast, the original Be-Se doublet at ambient pressure, of the stretching-bending type, turns into a pure-bending singlet at the approach of the high-pressure ZnSe-like rocksalt phase, an unnatural one for the Be-Se bonds. The "freezing" of the Be-Se stretching mode is discussed within the scope of the percolation model (mesoscopic scale), supported by ab initio insight into the pressure dependence of vibrational properties of the ultimate percolation-type Be-impurity motif (microscopic scale). Similar ab initio calculations are performed with (Ga,As)P, for reference purpose. © 2010 The American Physical Society.
Authors & Co-Authors
Pradhan, Gopal K.
India, Bengaluru
Jawaharlal Nehru Centre for Advanced Scientific Research
Narayana, Chandrabhas
India, Bengaluru
Jawaharlal Nehru Centre for Advanced Scientific Research
Pagès, Olivier
France, Metz
Laboratoire de Chimie et de Physique Approche Multi-échelles Des Milieux Complexes Lcp-a2mc
Breidi, A.
France, Metz
Laboratoire de Chimie et de Physique Approche Multi-échelles Des Milieux Complexes Lcp-a2mc
Souhabi, J.
France, Metz
Laboratoire de Chimie et de Physique Approche Multi-échelles Des Milieux Complexes Lcp-a2mc
Postnikov, Andrei V.
France, Metz
Laboratoire de Chimie et de Physique Approche Multi-échelles Des Milieux Complexes Lcp-a2mc
Deb, S. K.
India, Indore
Raja Ramanna Centre for Advanced Technology
Firszt, F.
Poland, Torun
Uniwersytet Mikołaja Kopernika w Toruniu
Paszkowicz, W.
Poland, Warsaw
Institute of Physics of the Polish Academy of Sciences
Shukla, A.
France, Paris
Institut de Minéralogie, de Physique Des Matériaux et de Cosmochimie
El Haj Hassan, Fouad
Lebanon, Beirut
Université Libanaise
Statistics
Citations: 11
Authors: 11
Affiliations: 7
Identifiers
Doi:
10.1103/PhysRevB.81.115207
ISSN:
10980121
e-ISSN:
1550235X