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SUMMARY:Towards a general theory for pyrochlores: dimensional reduction\, 
 ground-state selection and new emergent electromagnetism - Ludovic Jaubert
DTSTART:20130621T140000Z
DTEND:20130621T153000Z
UID:TALK45714@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:Pyrochlore oxides are a very rich family in magnetism where ea
 ch member brings its own personality. If some materials and models exhibit
  exotic phase transitions away from the Ginzburg-Landau paradigm\, other a
 re able to avoid ordering such as spin ice (Dy2Ti2O7) or potential spin li
 quids (Tb2Ti2O7). Yb2Ti2O7 for example has generated considerable exciteme
 nt lately as a potential example of a “quantum spin-ice”.\n\nHere we s
 how how it is possible to construct a unified picture of ground state and 
 excitations in a wide range of such materials. Our starting point is a sim
 ple effective field theory which explains both the dimensional reduction s
 een in Yb2Ti2O7\, and the ground-state selection in Er2Ti2O7. It also prov
 ides a general recipe to find emergent electromagnetism in such models. Th
 ese results are combined with spin wave calculations and extensive classic
 al Monte Carlo simulations to provide a comprehensive picture of the inter
 play between order and finite temperature excitations in pyrochlore oxides
  with highly-anisotropic exchange interactions.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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