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Observation of soft TO phonon modes in Pb1-xGexTe by Raman scattering in the near-infrared (λ=1.064μm)

T Humer-Hager, G Bauer and J Brandmuller

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The structural phase transition in Pb1-xGexTe was examined using Raman scattering by soft transverse optical phonon modes (q to 0). An infrared laser ( lambda =1.064 mu m) was employed to increase the scattering volume. The results are consistent with a second-order type of phase transition, which can occur in this pseudo-binary system according to a group theoretical analysis. Samples with Ge content x where 3.5<or=x<or=13.4% were studied.


PACS

78.30.Hv Other nonmetallic inorganics

64.70.K- Solid–solid transitions

63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions

61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 13 (10 May 1986)



  1. Observation of soft TO phonon modes in Pb1-xGexTe by Raman scattering in the near-infrared (λ=1.064μm)

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