13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

An emergent phase transition as an organizing principle for strongly correlated superconductors

18 Jun 2015, 14:15
30m
CCIS L1-140 (University of Alberta)

CCIS L1-140

University of Alberta

Invited Speaker / Conférencier invité Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) R2-2 Strongly correlated systems (DCMMP) / Systèmes fortement corrélés (DPMCM)

Speaker

Andre-Marie Tremblay (Universite de Sherbrooke)

Description

Band theory and BCS theory are arguably the most successful theories of condensed matter. Yet, both of them fail miserably for high-temperature cuprate superconductors and layered organic superconductors. New theoretical methods are required. In this talk, I compare experiment in cuprates and layered organics with theoretical results obtained from extensions of dynamical mean-field theory for the Hubbard model. In the presence of electronic repulsion strong enough to lead to a Mott insulator at half-filling, both the normal state and the superconducting state are unusual. In the normal state, a first-order transition between a metal and a pseudogap emerges from the Mott insulator. That first-order transition ends at a critical point. In the supercritical region, a Widom line and its precursor determine the crossovers seen experimentally. We demonstrate that much or the phase diagram, including superconductivity, is controlled by this first-order transition, a finite-doping signature of the Mott transition. In this strongly correlated regime, the maximum Tc is not concomitant with an antiferromagnetic quantum critical point, contrary to what is sometimes observed, for example in heavy fermions.

Primary author

Andre-Marie Tremblay (Universite de Sherbrooke)

Co-authors

Mr Charles-David Hébert (Université de Sherbrooke) Prof. Giovanni Sordi (Royal Holloway, University of London) Dr Patrick Sémon (Université de Sherbrooke)

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