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SUMMARY:Heavy quasiparticles in Yb compounds: The Renormalized Band approa
 ch - Gertud Zwicknagl\, University of Braunschweig
DTSTART:20130214T141500Z
DTEND:20130214T151500Z
UID:TALK42903@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:Results for the dispersion of "heavy" 4f-derived quasiparticle
 s in Yb-based compounds are presented. The bands are determined by means o
 f the Renormalized Band method. The topology of the Fermi surface differs 
 from the one predicted by standard band structure calculations  based on D
 ensity Functional Theory. This is in marked contrast to the situation enco
 untered in Ce-based Heavy Fermion  Systems where standard band structure c
 alculation usually provide reliable models for the Fermi surface. Calculat
 ions of the magnetic-field-induced changes of the heavy quasiparticles in 
 YbRh2Si2  are presented.  The progressive de-renormalization of the quasip
 articles in the magnetic field is accounted for using field-dependent quas
 iparticle parameters deduced from Numerical Renormalization Group studies.
  The results are related to recent measurements of thermodynamic and trans
 port properties.
LOCATION:TCM Seminar Room\, Cavendish Laboratory\, Department of Physics
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