Strong Correlations and Unconventional Superconductivity
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.