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- W2007062007 abstract "The transmission spectra of the amorphous semiconductor system (${mathrm{GeS}}_{2}$${)}_{mathrm{x}}$(${mathrm{As}}_{2}$${mathrm{S}}_{3}$${)}_{1mathrm{ensuremath{-}}mathrm{x}}$ are measured under hydrostatic pressure, and the dependence of the optical gap ${E}_{0}$ and the refractive index n on the pressure is studied. The large red shift in ${E}_{0}$ is attributed to the band-broadening effect originating in the increased interaction between the lone-pair electrons of the sulfur atoms. The change in the refractive index n is analyzed successfully by the Penn-Phillips-type two-oscillator model. Anomalous changes in the optical gap ${E}_{0}$ are observed for ${mathrm{GeS}}_{2}$-rich materials in the pressure range 20ensuremath{lesssim}Pensuremath{lesssim}40 kbar. Corresponding to these anomalies, a large hysteresis is also observed in the experimental curve of the optical gap ${E}_{0}$ versus pressure P. This anomaly is attributed to a structural change induced by pressure, and this suggests the existence of voids in the ${mathrm{GeS}}_{2}$-rich amorphous (${mathrm{GeS}}_{2}$${)}_{mathrm{x}}$(${mathrm{As}}_{2}$${mathrm{S}}_{3}$${)}_{1mathrm{ensuremath{-}}mathrm{x}}$ system." @default.
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- W2007062007 date "1987-03-15" @default.
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- W2007062007 title "Absorption edge of the amorphous (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>GeS</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></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:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mi mathvariant=normal>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>(<mml:math …" @default.
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- W2007062007 doi "https://doi.org/10.1103/physrevb.35.4373" @default.
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