J. Phys. I France
Volume 6, Numéro 1, January 1996
Page(s) 119 - 135
DOI: 10.1051/jp1:1996127
J. Phys. I France 6 (1996) 119-135

Extended Van-Hove Singularity and Related Non-Fermi Liquids

Igor Dzyaloshinskii

Institute Laue-Langevin, B.P. 156, 38042 Grenoble cedex 9, France

(Received 4 July 1995, revised 21 September 1995, accepted 5 October 1995)

A weak coupling theory of extended Van Hove Singularity (VHS) is developed. Effects of interaction are so strong that the VHS cannot be reached from the Fermi liquid side and a whole area in energy-momentum space around it is occupied by a non-Fermi liquid. Phenomenology of the non-Fermi liquid is discussed including the possibility that the non-Fermi liquid is a separate thermodynamic phase.

© Les Editions de Physique 1996

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