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SUMMARY:The Dual Nature of Electrons - Dr Filip Ronning (Los Alamos Nation
 al Laboratory)
DTSTART:20060612T101500Z
DTEND:20060612T111500Z
UID:TALK5032@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:Electrons in many strongly correlated materials fight two comp
 eting\ntendencies of becoming localized versus remaining itinerant. The re
 solution\nto this struggle often leads to fascinating phenomena such as hi
 gh Tc\nsuperconductors\, colossal magnetoresistance\, and heavy fermions. 
 I will\npresent our recent results on the CeMIn5 (M = Co\, Rh\, Ir) family
  of heavy\nfermions. De Haas van Alphen results have shown that the f elec
 tron can be\neither localized or itinerant depending on the chemical compo
 sition or\npressure. We have shown that the crossover from localized to it
 inerant\noccurs at the antiferromagnetic quantum critical point\, where di
 verging\nfluctuations lead to interesting non-Fermi liquid physics\, which
  can not be\nunderstood in the conventional framework of quantum phase tra
 nsitions. I\nwill then present several experiments from transport\, thermo
 dynamics\, and\nARPES which demonstrate the dual nature of electrons in va
 rious strongly\ncorrelated systems. Suggestions for unifying themes and fu
 ture directions\nwill be discussed.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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