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• W1627298667 abstract "The infrared reflectivity of sintered ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$, prepared under carefully controlled oxidation conditions, has been measured between 20 and 10 000 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ at temperatures between 10 and 300 K. In this paper we analyze in detail the temperature- and frequency-dependent far-infrared part of the spectrum. A Kramers-Kronig analysis allows us to compare the phonon part of the spectra with lattice-dynamical calculations. There is fairly good agreement concerning the assigned eigenfrequencies. The oscillator strengths of the experimentally observed phonons, however, are all stronger than those from a lattice-dynamics model which assumes ionic charges close to the formal ones. This is especially so for the lowest phonon found at 155 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ which shows a strength S=60ifmmodepmelsetextpmfi{}5 being about 15 times higher than theoretically expected. A possible origin of this effect is discussed qualitatively in terms of a Cu(1)-O(IV) charge shift during the vibration induced by the polarization field. The electronic background of the spectra has been analyzed by a Mattis-Bardeen type of dielectric response below ${T}_{c}$. The best fit yielded, for low T, a gap distribution in the range from about 160 to 370 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, corresponding to 2ensuremath{Delta}(0)/${k}_{B}$${T}_{c}$ values between 2.6 and 6.0." @default.
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• W1627298667 date "1989-08-01" @default.
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• W1627298667 title "Phonon anomalies and range of superconducting energy gaps from infrared studies of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</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:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:…" @default.
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• W1627298667 doi "https://doi.org/10.1103/physrevb.40.2170" @default.
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