Abstract
We report topology of the Fermi surface of superconducting system at the optimum doping determined by sequential angle-scanning photoemission combined with high intensity of synchrotron radiation. The Fermi surface at the optimum doping has a pseudogap around as in underdoped samples, showing missing segments near the points, and shadow bands around and equivalent locations. The dependence of the pseudogap shows a particular asymmetric topology that imposes a strong constraint on its theoretical explanation.
- Received 29 May 1997
DOI:https://doi.org/10.1103/PhysRevLett.79.3467
©1997 American Physical Society