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Abstract:
The temperature-dependent redistribution of the spectral weight of the
CuO2 plane-derived conduction band of the YBa2 Cu-3 O-6.9
high-temperature superconductor (superconducting transition temperature
= 92.7 kelvin) was studied with wide-band (0.01- to 5.6-electron volt)
spectroscopic ellipsometry. A superconductivity-induced transfer of the
spectral weight involving a high-energy scale in excess of 1 electron
volt was observed. Correspondingly, the charge carrier spectral weight
was shown to decrease in the superconducting state. The ellipsometric
data also provide detailed information about the evolution of the
optical self-energy in the normal and superconducting states.
