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 and H Kojima |
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| 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 |
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| 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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| Keywords: | La2– x
Sr
x
CuO4 positron annihilation ACAR Fermi surface Sr doping electronic structure |
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