Optical properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.85</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">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.15</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">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Evidence for strong electron-phonon and electron-electron interactions
S. L. HerrDepartment of Physics, University of Florida, Gainesville, Florida 32611K. KamarásDepartment of Physics, University of Florida, Gainesville, Florida 32611C. D. PorterDepartment of Physics, University of Florida, Gainesville, Florida 32611M. G. DossDepartment of Physics, University of Florida, Gainesville, Florida 32611D. B. TannerDepartment of Physics, University of Florida, Gainesville, Florida 32611D. A. BonnDepartment of Physics, University of Florida, Gainesville, Florida 32611J. E. GreedanDepartment of Physics, University of Florida, Gainesville, Florida 32611C. V. StagerDepartment of Physics, University of Florida, Gainesville, Florida 32611T. TimuskDepartment of Physics, University of Florida, Gainesville, Florida 32611
1987lv
ABI
Аннотация
The optical properties of the high-${T}_{c}$ superconductor ${\mathrm{La}}_{1.85}$${\mathrm{Sr}}_{0.15}$${\mathrm{CuO}}_{4}$ have been measured over the far-infrared through ultraviolet frequency range at temperatures between 4 and 300 K. The frequency-dependent conductivity shows strong vibrational features in the far infrared (240, 355, and 495 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) and two electronic transitions in the infrared (3500 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$/0.44 eV and 10 500 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$/1.3 eV). The measurements are interpreted within a model of strongly correlated electrons interacting strongly with vibrational modes.
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