Abstract
High-statistics (>4 × 108 counts), room-temperature measurements of the electron-positron momentum density of La2−x Sr x CuO4 have been performed for samples with Sr concentrations of x=0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane.
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Howell, R.H., Sterne, P.A., Fluss, M.J. et al. Influence of doping on the electronic structure of (La, Sr)2CuO4 . J Supercond 7, 169–173 (1994). https://doi.org/10.1007/BF00730389
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DOI: https://doi.org/10.1007/BF00730389