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SUMMARY:Manifestations of monopole physics in spin ice materials - Claudio
  Castelnovo\, Royal Holloway University of London
DTSTART:20111102T141500Z
DTEND:20111102T151500Z
UID:TALK34379@talks.cam.ac.uk
CONTACT:Aleksey Cherman
DESCRIPTION:Spin ice materials such as Dy2Ti2O7 and Ho2Ti2O7 provide a rar
 e instance of emergent gauge symmetry and fractionalisation in three dimen
 sions. Their elementary excitations carry a fraction of the magnetic momen
 t of the microscopic spin degrees of freedom\, and they can be thought of 
 as magnetic monopoles.  This talk aims at introducing spin ice models and 
 materials and reviewing their unusual properties. In particular\, the pecu
 liar nature of the excitations is discussed\, together with (some of the) 
 signatures that have been so far identified in the equilibrium and respons
 e properties of spin ice materials. These include unusual neutron scatteri
 ng structure factors\, dynamical arrest and long lived non-equilibrium met
 astable states\, as well as a response to external magnetic fields that pr
 omotes spin ice as a magnetic analogue of an electrolyte. The formulation 
 of the low-temperature phase in terms of an emergent gauge field permits a
 n unusual degree of analytical progress in the modelling of these material
 s.
LOCATION:MR2\, Centre for Mathematical Sciences
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