A fractional-spin phase in the power-law Kondo model |
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| Authors: | M Vojta R Bulla |
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| Institution: | Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universit?t Augsburg, 86135 Augsburg, Germany, DE
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| Abstract: | We consider a Kondo impurity coupled to a fermionic host with a power-law density of states near the Fermi level, ρ(ε) ∼ |ε|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.
Received 18 February 2002 Published online 31 July 2002 |
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| Keywords: | PACS 75 20 Hr Local moment in compounds and alloys Kondo effect valence fluctuations heavy fermions – 71 10 Hf Non-Fermi-liquid ground states electron phase diagrams and phase transitions in model systems |
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