In-Plane Spectral Weight Shift of Charge Carriers in $YB{a}_{2}C{u}_3{O}_{6.9}$

Abstract

The temperature dependent redistribution of the spectral weight of the $Cu{O}_2$ plane derived conduction band of the $YB{a}_{2}C{u}_3{O}_{6.9}$ high temperature superconductor (T_c = 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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