Fermi Surface and Band Dispersion in La2-xSrxCuO4

Details Fermi Surface and Band Dispersion in La2-xSrxCuO4 Fermi Surface and Band Dispersion in La2-xSrxCuO4

1998-09-23

arxiv.org/abs/cond-mat/9809311v3

J. Phys. Soc. Jpn. 68, 1496 (1999)

Physics

Condensed Matter

Superconductivity

5 pages, 4 EPS figures, uses epsf.sty

Scientific paper

10.1143/JPSJ.68.1496

Using angle-resolved photoemission spectroscopy (ARPES), we have observed the band structure, Fermi surface and their doping dependences in La2-xSrxCuO4. The results reveal that the Fermi surface undergoes a dramatic change: it is hole-like and centered at k=(pi,pi) in underdoped (x = 0.1) and optimally doped (x = 0.15) samples as in other cuprates while it is electron-like and centered at (0,0) in heavily overdoped (x = 0.3) ones. The peak in the ARPES spectra near (pi/2,pi/2) is broad and weak unlike in other cuprates. In the underdoped and optimally doped samples, a superconducting gap (Delta = 10 - 15 meV) is observed on the Fermi surface near (pi,0).

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