Is Magnetism Important in the Pnictide Superconductors?

Monday, February 11, 2013 at 4:00pm

Rockefeller Hall, Schwartz Auditorium Central Campus

Department of Physics Colloquium, Abhay Pasupathy, Columbia University. Refreshments at 3:30pm.

Abstract: Superconductivity in traditional materials like aluminum and lead is suppressed by the introduction of magnetic order. We have an intuitive picture of why this happens - magnetism breaks the degeneracy between up and down spins and thus hinders the formation of superconducting Cooper pairs. However, in a large number of recently discovered superconductors, it is observed that the superconducting phase of the material lies in close proximity to a magnetic phase. There is significant experimental evidence and theoretical speculation that magnetic fluctuations are actually responsible for superconductivity in these materials, but the issue is by no means settled. I will describe recent scanning tunneling microscopy measurements on the iron pnictide superconductors that give us insight into the nature of magnetism at the atomic scale and its relationship to superconductivity in these materials.

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Event Type

Seminar

Departments

Physics

Website

http://www.columbia.edu/cu/physics/fa...

Hashtag

#department_of_physics_colloquium_208

Contact E-Mail

cmc439@cornell.edu

Contact Name

Christine Clay

Contact Phone

255-7562

Speaker

Abhay Pasupathy

Speaker Affiliation

Columbia University

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