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VOLUME 59 | ISSUE 11 | PAGE 798
On Fermi condensate: near the saddle point and within the vortex core
The situation when the Fermi surface is close to the saddle point of the electron spectrum is favourable for the 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 normal state, which revealed an "extended saddle point singularity" [1] or "flat band" [2] in vicinity of the Fermi surface. The Fermi condensate can also appear in the core of quantized vortices.