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SUMMARY:Insulators\, metals\, pseudogaps and cuprate superconductivity - A
 ndre-Marie Tremblay\, University of Sherbrooke\, Canada.
DTSTART:20130619T101500Z
DTEND:20130619T111500Z
UID:TALK44959@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:Band theory and the BCS theory of superconductivity are the mo
 st successful theories of standard solid state physics. The failure of ban
 d theory became apparent in the 1940's when it was realized that because o
 f strong interactions\, half-filled-band materials that should have been m
 etallic were instead insulators\, so-called Mott insulators. The failure o
 f BSC theory became apparent in the 1970's when superconductivity was disc
 overed in the presence of strong repulsion instead of weak phonon-mediated
  attraction. In this talk\, I will present the results of Cluster Dynamica
 l Mean-Field Theory calculations for the simplest model that embodies the 
 physics of strong interactions\, the one-band Hubbard model. The resulting
  phase diagram shows that the effect of strong-interactions\, or of Mott p
 hysics if you want\, extends far from half-filling. In particular\, the ph
 ase diagram contains a first-order transition in the normal state at finit
 e doping as well as d-wave superconductivity. The first-order transition s
 eparates a pseudogap phase from a correlated metallic state. The pseudogap
  does not break symmetry and does not come from precursor Cooper pairs. Th
 e pseudogap temperature follows the so-called Widom-line of the first orde
 r transition\, a concept that I will explain. I will show that the phenome
 nology of the pseudogap and of superconductivity found for strong interact
 ions is very close to that of hole-doped high-temperature superconductors.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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