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arxiv: cond-mat/0108341 · v1 · submitted 2001-08-21 · ❄️ cond-mat.mtrl-sci

Low Temperature Phase Transition in Sr(0.66)Ba(0.34)Nb2O6 single Crystal Fibers

J. L. B. Faria (1) , C. W. A. Paschoal (1) , P. T. C. Freire (1) , A. P. Ayala (1) , F. E. A. Melo (1) , J. Mendes Filho (1) , I. A. Santos (2) , J. A. Eiras (2) ((1) Departamento de Fisica
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Universidade Federal do Ceara Fortaleza Ceara Brazil (2) Departamento de Fisica Universidade Federal de Sao Carlos Sao Carlos Sao Paulo Brazil)
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classification ❄️ cond-mat.mtrl-sci
keywords energygeometrytemperaturecm-1crystalfibersintensitymodes
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The structural changes in Sr(0.66)Ba(0.34)Nb2O6 single crystal fibers when the temperature decreases from 295 to 10 K is investigated by dielectric constant measurements and Raman spectroscopy. The anomaly observed in the plot of e is associated to the variation in the intensity and frequency of some Raman modes. We observe that the intensity of some low energy modes has a very singular behavior for the y(xz)y scattering geometry. In the high energy region (> 850 cm-1), a band at ~ 880 cm-1 disappears when the temperature is cooled down to 10K for the y(xz)y geometry and shifts to higher energy values for the y(zz)y geometry.

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