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SUMMARY:Electronic Correlations and Magnetic Frustration in the Iron Pnict
 ides - Qimiao Si\, Rice University\, Texas
DTSTART:20090625T131500Z
DTEND:20090625T141500Z
UID:TALK18023@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:Since the surprising discovery of high temperature superconduc
 tivity\nin the iron pnictides in 2008\, a large body of physical propertie
 s have \nalready been accumulated. These properties provide the basis for\
 nconsiderations on the microscopic physics of these copper-free systems.\n
 \nBased on the fact that they are "bad metals"\, I will make the case that
 \nthese systems are at the boundary between itinerancy and interaction-ind
 uced\nlocalization\; in other words\, they are metals close to a Mott tran
 sition.\nI will show how such a picture naturally leads to magnetic frustr
 ation\nin the form of J1-J2 superexchange interactions on the iron square 
 lattice.\nFinally\, I will describe the implications of the resulting micr
 oscopic model for \nthe existing experiments on magnetic structure and dyn
 amics\, for prospective\nmagnetic quantum criticality\, and for supercondu
 ctivity.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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