A fractional-spin phase in the power-law Kondo model
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Contributors
Abstract
We consider a Kondo impurity coupled to a fermionic host with a power-law density of states near the Fermi level, ρ(∈) ∼ |∈|r, with exponent r < 0. Using both perturbative renormalization group (poor man's scaling) and numerical renormalization group methods, we analyze the phase diagram of this model for ferromagnetic and antiferromagnetic Kondo coupling. Both sectors display non-trivial behavior with several stable phases separated by continuous transitions. In particular, on the ferromagnetic side there is a stable intermediate-coupling fixed point with universal properties corresponding to a fractional ground-state spin.
Details
Original language | English |
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Pages (from-to) | 283-287 |
Number of pages | 5 |
Journal | European Physical Journal B |
Volume | 28 |
Issue number | 3 |
Publication status | Published - 1 Aug 2002 |
Peer-reviewed | Yes |
Externally published | Yes |
Keywords
ASJC Scopus subject areas
Keywords
- 71.10.Hf Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems, 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions