Non-BCS pairing in anisotropic strongly correlated electron systems in solids
V. A. Khodel+*, J. W. Clark*
+Russian Research Center "Kurchatov Institute", 123182 Moscow, Russia
*McDonnell Center for the Space Sciences and Department of Physics, Washington University, MO 63130, USA
PACS: 74.20.Mn
Abstract
The problem of pairing in anisotropic electron systems possessing
patches of fermion condensate in the vicinity of the van Hove points
is analyzed. Attention is directed to opportunities for the
occurrence of non-BCS pairing correlations between the states
belonging to the fermion condensate. It is shown that the physical
emergence of such pairing correlations would drastically alter the
behavior of the single-particle Green function, the canonical pole
of Fermi-liquid theory being replaced by a branch point.