On Magnetic Impurities in Gapless Fermi Systems
| dc.creator | Borkowski, L. S. | |
| dc.date | 1996-06-11 | |
| dc.date.accessioned | 2026-07-07T09:59:10Z | |
| dc.date.available | 2026-07-07T09:59:10Z | |
| dc.description | In ordinary metals, antiferromagnetic exchange between conduction electrons and a magnetic impurity leads to screening of the impurity spin below the Kondo temperature, $T_K$. In systems such as semimetals, small-gap semiconductors and unconventional superconductors, a reduction in available conduction states near the chemical potential can greatly depress $T_K$. The behavior of an Anderson impurity in a model with a power-law density of states, $N(ε) \sim |ε|^r$, $r>0$, for $|ε| < Δ$, where $Δ\ll D$, is studied using the non-crossing approximation. The transition from the Kondo singlet to the magnetic ground state can be seen in the behavior of the impurity magnetic susceptibility $χ$. The product $Tχ$ saturates at a finite value at low temperature for coupling smaller than the critical one. For sufficiently large coupling $Tχ\to 0$, as $T \to 0$, indicating complete screening of the impurity spin. | |
| dc.description | 4 pages + 2 postscript figures, uses RevTeX, psfig.sty, submitted to the European Conference "Physics of Magnetism", Poznan, June 1996 | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9606075 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9606075 | |
| dc.identifier | Acta Phys. Pol. 91, 359 (1997) | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/167929 | |
| dc.subject | Condensed Matter | |
| dc.title | On Magnetic Impurities in Gapless Fermi Systems | |
| dc.type | text |