A fractional-spin phase in the power-law Kondo model

Details A fractional-spin phase in the power-law Kondo model A fractional-spin phase in the power-law Kondo model

2001-10-04

arxiv.org/abs/cond-mat/0110079v2

Eur. Phys. J. B 28, 283 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figs; (v2) extended discussion and added refs; final version as published

Scientific paper

We consider a Kondo impurity coupled to a fermionic host with a power-law density of states near the Fermi level, rho(epsilon) ~ |epsilon|^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 second-order 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.

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