In-Plane Spectral Weight Shift of Charge Carriers in YBa2Cu3O6.9
A. V. Boris, N. N. Kovaleva, O. V. Dolgov, T. Holden, C. T. Lin, B. Keimer, C. Bernhard
Abstract
The temperature dependent redistribution of the spectral weight of the CuO2 plane derived conduction band of the YBa2Cu3O6.9 high temperature superconductor (Tc = 92.7 K) was studied with wide-band (from 0.01 to 5.6 eV) spectroscopic ellipsometry. A superconductivity - induced transfer of the spectral weight involving a high energy scale in excess of 1 eV 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.
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