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• W2014307819 abstract "We have conducted an extensive Raman scattering study of the effects hydrostatic pressure has on ${mathrm{Al}}_{mathit{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$As alloy phonons for 0ensuremath{leqslant}xensuremath{leqslant}0.70. The mode-Gruneisen parameter ensuremath{gamma} is found to depend on x. The variation is monotonic in dilution and increases by 30% over the range of x studied. We find that ensuremath{gamma} for GaAs-like and AlAs-like longitudinal-optic (LO) phonons correlates with Born's transverse dynamic effective charge on the respective alloy component. We suggest that this phenomenon is specific to alloys, and interpret it as a consequence of charge transfer on the cation sublattice. Pressure induced resonance Raman scattering is examined for x=0.40. We observe strong enhancement for both LO phonons when in resonance with the direct energy gap. textcopyright{} 1996 The American Physical Society." @default.
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• W2014307819 date "1996-09-15" @default.
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• W2014307819 title "Pressure dependence of the optic phonon energies in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Al</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi …" @default.
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• W2014307819 doi "https://doi.org/10.1103/physrevb.54.8714" @default.
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