Electronic Structure of High Tc Cuprates by Electron Spectroscoies
Employing electron spectroscopic techniques, we show that the ground state of these high TC cuprates is primarily described in terms of mixed valency between 3d9 and 3d10-related configurations, with very little Cu3+(3d8) configuration. Temperature dependent changes in the spectral features are interpreted in terms of formation of dimerized hole species in primarily oxygen p-derived band, while Cu concomitantly assumes a larger proportion of 3d10 related configuration. It is also shown that the formation of these dimerized hole species leads to a drastic decrease in the frequency dependent surface resistivity of the samples.
KeywordsMixed Valency Photoemission Spectrum Electron Energy Loss Spectrum Temperature Dependent Change Dependent Resistivity
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