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SUMMARY:Layered Kondo lattice model for novel quantum critical compound be
 ta-YbAlB4 - Dr Andriy Nevidomskyy\, Rutgers University
DTSTART:20090112T141500Z
DTEND:20090112T151500Z
UID:TALK16181@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION: We perform a theoretical analysis of the magnetic and electro
 nic\nproperties of the quantum critical heavy fermion superconductor\nbeta
 -YbAlB4. Using a combination of the realistic material modelling\nand sing
 le-ion crystal field analysis\, we propose a layered Kondo\nlattice model 
 for this system\, in which two dimensional boron layers are\nKondo-coupled
  via interlayer Yb moments in a J~z~ = 5/2 state.\nThis model fits the mea
 sured single ion magnetic susceptibility\nand predicts a substantial chang
 e in the electronic anisotropy\nas the system is pressure-tuned through th
 e quantum critical point.\nAn interesting connection is made between this 
 model and the Kondo\neffect in Coulomb-blockaded quantum dots.\nWe also ca
 lculate the Fermi surface and the angular dependence of\nthe extremal orbi
 ts relevant to the de Haas-van Alphen measurements.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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