Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Cuprate Superconductivity Without a 'Model'

Anthony J. Leggett
University of Illinois at Urbana-Champaign

Wednesday, March 20, 2002
1:30 PM @ Stirling Hall, Theatre A

Abstract:

I start by reviewing the question: What can we reasonably say we know for sure about superconductivity in the cuprates, without reliance on any microscopic "model"? Then I ask: On the basis of this knowledge and of some very generic and hopefully reasonable assumptions, are there interesting questions we can ask which we have some hope of answering definitively by experiment? I identify one such question, namely: In which regions of momentum and frequency space is the interaction energy between conduction electrons saved (or expended) when the system becomes superconducting? I conjecture a possible answer to this question, show that it is consistent with the dependence of the transition temperature on the c-axis layering structure and emphasize that it makes quantitative and experimentally testable predictions.

Refreshments will be available in the department lounge at 2:30 pm.