Behavior of magnetic impurities in gapless Fermi systems
Behavior of magnetic impurities in gapless Fermi systems
In a number of systems, including certain semiconductors and unconventional superconductors, the effective density of states varies like |E-${\mathit{E}}_{\mathit{F}}$${\mathrm{|}}^{\mathit{r}}$ near the Fermi energy. The behavior of dilute magnetic impurities in such systems is studied using a nonperturbative renormalization-group approach. Close to particle-hole symmetry, the Kondo effect is suppressed for the …