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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1165
DTSTART:20080522T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T215803Z
LAST-MODIFIED:20080408T182718Z
LOCATION:5310 Chamberlin
SUMMARY:Order by distortion and chiral magnetism in frustrated pyrochl
 ore magnet\, R. G. Herb Condensed Matter Seminar\, Gia-Wei Chern\, Joh
 ns Hopkins University
DESCRIPTION:Flexible pyrochlore antiferromagnet is known to be unstabl
 e<br>
\nagainst lattice distortion which relieves the magnetic frustra
 tion<br>
\nand makes long-range magnetic order possible. In many cases
 <br>
\nthe distortion breaks the inversion symmetry\, thus making the<
 br>
\ncrystal structure chiral. The handedness is transferred to the<b
 r>
\nmagnetic order by the relativistic spin-orbit coupling\, which is
  manifested as the Dzyaloshinskii-Moriya (DM) interaction between near
 est-neighbor spins. In this talk\, I will discuss the basic mechanism 
 of degeneracy-breaking through spin-lattice coupling in pyrochlore ant
 iferromagnet. The chiral nature of the DM interaction is important to 
 the determination of the resulting ground state magnetic order. Our th
 eoretical model successfully describes the ground state of spinel CdCr
 2O4. I will also give other more complicated examples and our speculat
 ions on the magnetic order of ZnCr2O4.
URL:https://www.physics.wisc.edu/events/?id=1165
END:VEVENT
END:VCALENDAR