Strong Correlations and Unconventional Superconductivity: Towards a Conceptual Framework

Coordinators: Piers Coleman, J.C. Séamus Davis, Peter Hirschfeld, Srinivas Raghu, Qimiao Si

Note: This conference is nearing capacity. We are still accepting registrations, but we reserve the right to stop accepting registrations at any time and implement a waiting list.

The conference seeks to bring researchers from different subfields of superconductivity research together to share insights on the nature of unconventional electron pairing. Participants will work towards constructing a conceptual framework with which to understand the relationship between strong electron correlations, commensurate magnetism, concurrent ordered phases and unconventional superconductivity. The conference will address such challenges for a broad range of unconventional superconductors. While attention will be given to novel aspects of the recently discovered iron-based superconductors, discussion will also focus on the heavy fermion materials, organic charge-transfer salts, and copper oxides.

With regard to the Fe-based materials, questions include:

  • Is the magnetism associated with quasi-localized moments or does it originate from itinerant electrons near Fermi surfaces? 
  • How should we treat systems that are neither weakly or strongly correlated?  How to marry the two extremes represents a great challenge.
  • What is the role of the orbital degrees of freedom? 
  • Is the pairing symmetry universal across all the iron pnictides and chalcogenides? 
  • What determines the pairing amplitudes, and how can one enhance the superconducting transition temperature? 
  • What is the relationship of the superconductivity to the local quantum chemistry? In particular, what is the role of iron tetrahedra and how should one interpret the close link between tetrahedral symmetry and optimal Tc

The conference will furthermore explore similarities and differences with other classes of unconventional superconductors: their evolution from bad metal states, possible common spin fluctuation pairing mechanism, dependence on multi-orbital fluctuations, and relation to magnetic competing order.

Poster Session: During the conference there will be an opportunity to present a poster. If you are interested in presenting a poster please submit an abstract using the web form.  Each poster board is 4 feet high x 6 feet wide. We ask that the posters be no larger than 44 inches high x 34 inches wide at the most. Deadline: September 16, 2014