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SUMMARY:Phase transitions in highly constrained spin systems:\nOrdering fr
 om the Coulomb phase. - Prof. John Chalker\, University of Oxford
DTSTART:20071011T131500Z
DTEND:20071011T144500Z
UID:TALK8466@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:Many classical\, geometrically frustrated antiferromagnets hav
 e\n macroscopically degenerate ground states. In a class of\n three-dimens
 ional systems\, the set of degenerate ground states has\n power-law correl
 ations and is an example of a Coulomb phase\, with\n long-wavelength fluct
 uations described by a Gaussian solenoidal\n field. A perturbation applied
  to the system can lift the degeneracy\n and induce a phase transition. Be
 cause of the power-law correlations\n (or\, equivalently\, the solenoidal 
 nature of the degrees of freedom)\,\n phase transitions of this kind are u
 nusual.\n\nIn this seminar\, I aim to give a straightforward introduction 
 to the\narea and to discuss these phase transitions from several points of
  view.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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