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SUMMARY:High magnetic fields: A tool for studying strongly correlated syst
 ems - Cyril Proust\, Laboratoire National des Champs Magntiques Pulss
DTSTART:20060426T101500Z
DTEND:20060426T111500Z
UID:TALK4774@talks.cam.ac.uk
CONTACT:cb203
DESCRIPTION:In the first part of my talk\, I will present recent achieveme
 nt in\nthermoelectricity measurements in pulsed magnetic field. We have\ni
 nvestigated the so-called 'metamagnetic transition' around H=35 T in the\n
 heavy fermion URu2Si2. Both Nernst coefficient and thermopower show an\nan
 omaly at the transition\, which allow us to reconstruct the phase diagram\
 nat low temperature and high magnetic field. Data provide significant\ninf
 ormation about the 'hidden order' in URu2Si2.\nHigh magnetic fields can al
 so be used to quench superconductivity in\nunderdoped cuprates and therefo
 re to investigate the nature of the ground\nstate. We have studied the mag
 netoresistance of high-quality single\ncrystals of YBa2Cu3Oy and YBa2Cu4O8
  up to 60 T. In contrast to other\ncuprates\, where localization masks the
  intrinsic low-temperature\nproperties of the entire underdoped region\, t
 he metallic regime in the\npresent materials extends deep into the so-call
 ed pseudogap phase. We\nargue that these are the defining low-energy prope
 rties of the electron\nsystem as it evolves towards the Mott insulator\, i
 n the absence of\ndisorder and competing phases.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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