Raman study of the effect of oxygen stoichiometry on the phonon spectrum of the high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
R. M. MacfarlaneIBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099H. J. RosenIBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099E. M. EnglerIBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099R. D. JacowitzIBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099V. Y. LeeIBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
1988lv
ABI
Аннотация
We have carried out a study of the effect of oxygen stoichiometry on the $k=0$ phonon spectrum of the high-${T}_{c}$ superconductor $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{x}$ using Raman spectroscopy. Polycrystalline samples were prepared with oxygen content $x$ varying from 7.0, where the material is orthorhombic and superconducting, to 6.0, where it is tetragonal and semiconducting. The frequency and intensity of the $k=0$ phonon modes of ${A}_{g}$ symmetry at 151, 340, 435, and 502 ${\mathrm{cm}}^{\ensuremath{-}1}$ (for $x=7$) were studied as a function of oxygen content.
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