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Electron-Like Fermi Surface and Remnant (pi,0) Feature in Overdoped La1.78Sr0.22CuO4

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arxiv cond-mat/0011172 v3 pith:43Q44A2G submitted 2000-11-10 cond-mat.supr-con cond-mat.str-el

T. Yoshida , X. J. Zhou , M. Nakamura , S. A. Kellar , P. V. Bogdanov , E. D. Lu , A. Lanzara , Z. Hussain
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A. Ino T. Mizokawa A. Fujimori H. Eisaki C. Kim Z.-X. Shen T. Kakeshita S. Uchida
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classification cond-mat.supr-concond-mat.str-el
keywords fermibandcuo4curvesdatadistributionelectron-likeevidence
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We have performed an angle-resolved photoemission study of overdoped La1.78Sr0.22CuO4, and have observed sharp nodal quasiparticle peaks in the second Brillouin zone that are comparable to data from Bi2Sr2CaCu2O8+d. The data analysis using energy distribution curves, momentum distribution curves and intensity maps all show evidence of an electron-like Fermi surface, which is well explained by band structure calculations. Evidence for many-body effects are also found in the substantial spectral weight remaining below the Fermi level around (pi,0), where the band is predicted to lie above EF.

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