Precursor Pairing Correlations and Pseudogaps

Abstract

I begin by briefly reviewing various experimental results on the pseudogap phenomena in underdoped cuprates. I argue that, taken together, all of these lead to a picture of singlet pairing above $T_c$. I then explore the idea that the pseudogap is a normal state precursor of the superconducting gap due to local, dynamic pairing correlations in a state without long range phase coherence. Early work on simple model systems which exhibit pseudogap anomalies in the normal state of 2D superconductors in a low density, small pair size regime is reviewed and critically re-examined in view of more recent developments. I also describe recent studies of how the underlying d-wave superconducting ground state affects the anisotropy of the pseudogap and the destruction of the Fermi surface.

23 pages, 9 postscript figures, RevTex; Varenna Lectures, 1997

Cited by in corpus (6)

• From Fermi Arcs to the Nodal Metal: Scaling of the Pseudogap with Doping and Temperature
• Preformed pairs in flat Bloch bands
• Emergence of a pseudogap in the BCS-BEC crossover
• Fluctuation Effects on the Transport Properties of Unitary Fermi Gases
• Translational-invariant bipolarons and superconductivity
• Tuning across the BCS-BEC crossover in the multiband superconductor Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$ : An angle-resolved photoemission study