Behavior of magnetic impurities in gapless Fermi systems

Details Behavior of magnetic impurities in gapless Fermi systems Behavior of magnetic impurities in gapless Fermi systems

1996-05-03

arxiv.org/abs/cond-mat/9605025v2

Physics

Condensed Matter

RevTex, 5 pages, 3 epsf-embedded EPS figures. Important reference added (Ref. 10), other minor changes

Scientific paper

10.1103/PhysRevB.54.11936

In a number of systems, including certain semiconductors and unconventional superconductors, the effective density of states varies near the Fermi energy like $|E-E_F|^r$. The behavior of dilute magnetic impurities in such systems is studied using a non-perturbative renormalization-group approach. Close to particle-hole symmetry, the Kondo effect is suppressed for the cases of greatest relevance ($r=1$ and $2$). Away from this symmetry, any quenching of the impurity moment is accompanied by a low-temperature decrease in the impurity resistivity, rather than the increase found in metals.

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