Abstract
Experimental confirmation of the existence of intrinsic luminescence in ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathit{x}}$ and ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathit{x}}$ high-temperature superconductors has been obtained by investigation of luminescence and reflectivity spectra of single crystals cleaved at liquid-helium temperatures in ultrahigh vacuum. A correlation between the radiation instability (photon-stimulated desorption of oxygen molecules) and the quenching of the intrinsic luminescence has also been obtained from the dependence on the synchrotron-radiation photon flux. We conclude that the luminescence originates from an oxygen quasimolecule formed as a result of electron-excitation localization in a Cu-O plane.
Published Version
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