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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2867
DTSTART:20130221T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T041626Z
LAST-MODIFIED:20130214T222336Z
LOCATION:5310 Chamberlin
SUMMARY:Spin-Orbit Tuned Ground States in Single-Crystal Iridates\, R.
  G. Herb Condensed Matter Seminar\, Gang Cao\, University of Kentucky\
 , Lexington
DESCRIPTION:The most profound result of the <i>spin-orbit interaction<
 /i> (SOI) on iridates is the <i>J<sub>eff</sub>=1/2 insulating state</
 i>\, a new quantum state that represents the novel physics in the 5d-b
 ased systems. The SOI vigorously competes with Coulomb interactions\, 
 non-cubic crystal electric field and Hund's rule coupling\, and critic
 ally biases their mutual competition to stabilize ground states with e
 xotic behavior\, which sharply contrasts with traditional models. Inde
 ed\, two conspicuous phenomena are commonly observed among layered iri
 dates: (1) the J<sub>eff</sub> = 1/2 insulating state\, and (2) relati
 vely high magnetic ordering temperatures and complex magnetic states t
 hat are not predicted by existing models. In this talk\, we review the
  underlying physical properties of the layered iridates\, and report r
 esults of our study that emphasizes spin-orbit-tuned ground states sta
 bilized by chemical doping\, application of pressure and magnetic fiel
 d\; these weak perturbations are capable of directly reducing the SOI 
 so as to rebalance comparable interactions to generate a rich phase di
 agram of strongly competing ground states controlled by the SOI. 
URL:https://www.physics.wisc.edu/events/?id=2867
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