Quantum criticality and the break-up of the Kondo pseudo-potential
arXiv:0706.0026 · doi:10.1016/j.physb.2007.10.312
Abstract
We discuss how Anderson's ideas of nominal and real valence can be incorporated into the current discussion of heavy electron quantum criticality. In the heavy electron phase, the nominal valence of a screened magnetic ion differs from its real valence by one unit. We identify this discrepancy with the formation of a positively charged background we call the Kondo pseudo-potential. At the quantum critical point, the sudden collapse of the heavy electron Fermi surface can be identified with the return of the nominal to the real valence. This leads to the interesting idea that the heavy electron quantum critical point may involve locally critical charge degrees of freedom. We discuss how this might come about within a large N Schwinger boson scheme.
arXiv commentInvited talk at SCES 2007, Houston, Texas
References in corpus (9)
- Locally critical quantum phase transitions in strongly correlated metals
- Hall-effect evolution across a heavy-fermion quantum critical point
- Fractionalized Fermi liquids
- Scaling of magnetic fluctuations near a quantum phase transition
- Transition from overscreening to underscreening in the multichannel Kondo model: exact solution at large N
- Sum Rules and Ward Identities in the Kondo Lattice
- Fractionalization and Fermi surface volume in heavy fermion compounds: the case of YbRh Si
- Schwinger Boson approach to the fully screened Kondo model
- Conserving many body approach to the fully screened, infinite U Anderson model