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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2346
DTSTART:20111121T223000Z
DURATION:PT1H0M0S
DTSTAMP:20260416T232106Z
LAST-MODIFIED:20111117T163523Z
LOCATION:5310 Chamberlin
SUMMARY:Spin resonance in Fe-based superconductors\, Condensed Matter 
 Theory Group Seminar\, Saurabh Maiti\, UW-Madison
DESCRIPTION:Fe-based superconductors(FeSCs) and cuprates are often hel
 d as prime candidates for study that can lead to the understanding of 
 the unconventional high Tc superconductivity. In this talk\, I will br
 iefly mention the motivation behind looking for spin resonance in unco
 nventional superconductors. I will mention some the similarities and d
 ifferences that are seen in experiments in these two family of compoun
 ds. Unlike in the cuprates where people agree on the d-wave symmetry\,
  FeSCs are much more interesting. Different symmetries and structures 
 are possible for the gap structure in these materials. Observation of 
 a spin resonance indicates presence of on order parameter that needs t
 o flip its sign in some parts of the Fermi-surface. Experiments in FeS
 C actually see a relatively broad peak (unlike in cuprates) and this h
 as been argued by some groups to be due to a 'sign preserving' order p
 arameter contrary to the popular 'sign-flipping' order parameter in Fe
 SCs. In this talk I will present our resolution of the conflict and ex
 plain how the experimental observations can be understood by accountin
 g for nodes in the gap\, impurity scattering and Fermi-surface geometr
 y. 
URL:https://www.physics.wisc.edu/events/?id=2346
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