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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2296
DTSTART:20111215T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T095939Z
LAST-MODIFIED:20111128T141237Z
LOCATION:5310 Chamberlin
SUMMARY:Orbital and magnetic ordering in  ZnV2O4\, R. G. Herb Condense
 d Matter Seminar\, Yasuyuki Kato\, Los Alamos National Laboratory
DESCRIPTION:Spinel group comprise corner sharing tetrahedra and consti
 tute paradigmatic examples of geometrically frustrated lattices. The s
 pinel compound\, ZnV2O4\, is a Mott insulator with a rather small char
 ge gap that undergoes a structural cubic to tetragonal transition at T
 =50(K). A magnetic transition at a lower temperature of T=40(K) has al
 so been reported for this compound. The magnetic ordering corresponds 
 to up-up-down-down spin configurations for chains oriented along the y
 z and zx directions. The origin of this magnetic ordering and the lack
  of orbital ordering in this material has been an open problem for sev
 eral decades. The main obstacle was the lack of controlled and unbiase
 d approaches for solving the correlated and frustrated model. I will i
 ntroduce a novel quantum Monte Carlo method that can simulate the thre
 e-band Hubbard model relevant for these materials without generating a
 ny serious problem. We will see that this unbiased approach not only e
 xplains the observed magnetic ordering but also the lack of orbital or
 dering. 
URL:https://www.physics.wisc.edu/events/?id=2296
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