Theory of the leading edge gap in underdoped cuprates
Department of Physics, University of Wisconsin - Madison, WI 53706, USA
Accepted: 6 October 1998
We present the theory of the leading edge gap in the normal state of underdoped high-Tc materials. The consideration is based on a magnetic scenario for cuprates. We show that as doping decreases, the increasing interaction with paramagnons gives rise to a near destruction of the quasiparticle peak near and symmetry related points. We then solve the d-wave pairing problem and show that the actual Tc decreases with the strength of the coherent quasiparticle peak, but the precursors to d-wave state exist above Tc even for fully incoherent quasiparticles.
PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems
© EDP Sciences, 1998