Strong coupling theory of quantum critical points in heavy fermion compounds

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Date/Time:Thursday, 03 Nov 2011 - Thursday, 03 Nov 2011
Location:PHYSICS Room 5
Phone:515-294-5630
Channel:Condensed Matter Physics
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Peter Woelfle
Institute of Condensed Matter Theory, Karlsruhe Institute of Technology, Germany

Following a brief general introduction into quantum phase transitions the case of antiferromagnetic transitions in heavy fermion metals is discussed. It is shown that in certain cases the effective mass of fermionic quasiparticles diverges at the critical point. Using an extension of Landau quasiparticle theory the coupling of the critical behavior in the fermionic and bosonic sector is shown to lead to a new type of scaling behavior with unusual critical exponents. The theory accounts well for the up to now unexplained critical behavior of YbRh2Si2.