Unconventional sign-changing s-wave pairing symmetry in Fe-based superconductors

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Date/Time:Monday, 04 Apr 2011 from 4:10 pm to 5:10 pm
Location:Physics, Room 5
Phone:515-294-9901
Channel:Colloquium
Categories:Lectures
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Igor Mazin (Naval Research Laboratory)

I will first give a general description of the novel Fe-based high temperature superconductors, and will give a short introduction into the spin-fluctuation induced superconductivity. I will review the basic theoretical arguments that led to the so-called $s_pm$ symmetry being predicted well before any experimental indications. Next I will list $negative$ experimental evidence and argue that triplet pairing and d- wave pairing can be with a good degree of confidence excluded. Lastly, I will address the issue of distinguishing between the $s_pm$ and a conventional $s_{++}$ states, in terms of already existing and potential experiments. Finally, I will also discuss the fact that gap nodes seem to exist in some, but not the others, Fe-based superconductors, and possible possible locations and theoretical mechanisms for the gap nodes.

Bio:
http://cst-www.nrl.navy.mil/users/mazin/CV.pdf