Gap structure and symmetry of Fe-based SuperconductorsExport this event to calendar

Thursday, March 8, 2012 — 3:30 PM to 5:00 PM EST

Physics colloquium

Speaker
Peter Hirschfeld
Speaker's Institute: 
University of Florida, Gainesville

Gap structure and symmetry of Fe-based Superconductors

The new Fe-based superconductors have occasioned considerable excitement because transition temperatures are high, and it is hoped that the existence of a second class of such superconductors in addition to cuprates will lead to new insights into the essential ingredients for high temperature superconductivity. I will review what is known about the superconducting state and explain the basis for the near-consensus that almost all pnictide materials display spin singlet, s-wave symmetry.

Different experimental probes on different materials show a large diversity of superconducting gap structures, with claims of both gap nodes and fully gapped behavior. Within the context of a spin fluctuation pairing theory of such systems, this variety of gap structures, unexpected based on intuition from the high-Tc cuprates, is easy to understand. High-Tc superconductivity in these unusual multiband materials poses anew, and offers new insight into, the question of how higher temperature superconductivity can be achieved.

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