Abstract
We present a combined experimental and theoretical study of the effects of Sr doping on the electronic structure of La 2− x Sr x CuO 4. Electron-positron momentum distributions have been measured to high statistical precision (> 4 × 10 8 counts) at room temperature for samples with Sr concentrations of x = 0.0, 0.1, 0.13 and 0.2. Analysis of all tour spectra reveal strong features due to electron-positron wavefunction overlap, in quantitative agreement with theoretical calculations. The Sr doped samples show discontinuities consistent with the presence of a Fermi surface. The form and position of these features are in general agreement with the predictions of band theory. Correspondence between theory and experiment, as well as some differences, are revealed by a detailed study of the changes in electron-positron momentum density with increasing Sr doping.
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