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SUMMARY:Competition between antiferromagnetism and superconductivity in lo
 w-dimensional magnets - Chris Stock\, ISIS
DTSTART:20080206T111500Z
DTEND:20080206T121500Z
UID:TALK10610@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:The competition between superconductivity and antiferromagneti
 sm has been a topic of much interest recently mainly as the result of the 
 discovery of\nhigh-temperature superconductivity in the two dimensional cu
 prates and unusually high transition temperatures in the heavy fermion CeT
 In5 system\n(where T=Co\, Rh\, or Ir).  In the cuprates\, superconductivit
 y results by doping an insulating two-dimensional antiferromagnet with eit
 her holes or electrons.\n\nIn contrast\, in the two dimensional CeTIn5 sys
 tem\, superconductivity emerges from a metallic spin-density wave ground s
 tate.  I will present an experimental\noverview of the magnetic properties
  in the CeCoIn5 and YBa2Cu3O6+x superconductors.   I will first provide an
  outline of YBa2Cu3O6+x illustrating how the magnetic properties (probed t
 hrough the use of neutron scattering) evolve on doping the insulating phas
 e to achieve high temperature superconductivity.  This review will highlig
 ht some of the conflicting ideas\ndescribing this transition as well as so
 me theoretical challenges.  I will then provide a summary of the magnetic 
 properties of superconducting CeCoIn5 and\nantiferromagnetic CeRhIn5.  The
  results will be compared with current band calculations and experimental 
 data for the cuprates.  The nature of the\ncritical point defining the tra
 nsition to a superconductor in both systems will be discussed.\n\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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