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Influence of doping on the electronic structure of (La,Sr)2CuO4 |
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| Authors: | R H Howell P A Sterne M J Fluss J H Kaiser K Kitazawa H Kojima |
| Affiliation: | 1. Lawrence Livermore National Laboratory, 94550, Livermore, California 2. University of California, 95616, Davis, California 3. University of Texas at Arlington, 76019, Texas 4. University of Tokyo, Tokyo, Japan 5. Yamanashi University, Kofu, Japan |
| 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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