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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3668
DTSTART:20150417T203000Z
DTEND:20150417T213000Z
DTSTAMP:20260416T144435Z
LAST-MODIFIED:20150330T210705Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:Has Compelling Experimental Evidence for Order-by-Disorder at 
 Last Been Found in a Frustrated Magnetic Material?\, Physics Departmen
 t Colloquium\, Michel Gingras\, University of Waterloo
DESCRIPTION:In some magnetic systems\, known as frustrated magnets\, t
 he lattice geometry or the competition between different spin-spin int
 eractions can lead to a sub-exponentially large number of accidentally
  degenerate classical ground states. Order-by-disorder (ObD) is a conc
 ept of central importance in the field of frustrated magnetism. Saddle
 d with large accidental degeneracies\, a subset of states\, those that
  support the largest quantum and/or thermal fluctuations\, may be sele
 cted to form true long-range order. ObD has been discussed extensively
  on the theoretical front for over 30 years and proposed to be at play
  in a number of experimental settings. Unfortunately\, convincing demo
 nstrations of OBD in real materials have remained scarce. In this talk
 \, I will review the phenomena of thermal and quantum of order-by-diso
 rder and discuss how recent work may have evinced compelling evidence 
 for ObD in some frustrated pyrochlore oxide antiferromagnetic material
 s.
URL:https://www.physics.wisc.edu/events/?id=3668
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