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VOLUME 59 (1994) | ISSUE 11 | PAGE 798
The Fermi condensate near the saddle point and in the vortex core
The case in which the Fermi surface is near the saddle point of the electron spectrum is favorable for formation of the fermionic condensate—a flat plateau in the quasiparticle energy at the Fermi level. This may explain the results of the angle-resolved photoemission experiments on YBaCuO and BiSrCaCuO in the normal state, which revealed an "extended saddle-point singularity"1 or "flat band"2 in the vicinity of the Fermi surface. The Fermi condensate can also appear in the core of quantized vortices.