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SUMMARY:Critical Casimir Forces in a Magnetic System: An Experimental Prot
 ocol - Prof. Peter Holdsworth\, Ecole Normale Supérieure de Lyon
DTSTART:20140704T131500Z
DTEND:20140704T141500Z
UID:TALK51712@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:Close to a critical point of a continuous phase transition in 
 a confined system fluctuations give rise to the critical Casimir force whe
 n the correlation length becomes of the order of the system size. Indirect
  measurements in 4He wetting films near the superfluid transition and both
  direct and indirect measurements in binary liquid mixtures have been perf
 ormed. The Casimir force being a critical finite size effect\, its univers
 al functional form has been studied theoretically and numerically in the I
 sing and XY models as a generalized thermodynamic force\, dOmega/dL\, wher
 e Omega is the magnetic free energy. However\, no measurement of the criti
 cal Casimir effect in magnetic systems has been performed. We introduce a 
 new numerical experiment that follows a magnetic protocol which could in p
 rinciple be adapted to experiments on thin film magnets.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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