Physics – Condensed Matter
Scientific paper
1998-11-09
Physics
Condensed Matter
4 pages Latex
Scientific paper
10.1103/PhysRevLett.81.4975
Exact results for the thermodynamic properties of ensembles of magnetic impurities with randomly distributed host-impurity couplings in the quantum antiferromagnetic Heisenberg model are presented. Exact calculations are done for arbitrary values of temperature and external magnetic field. We have shown that for strong disorder the quenching of the impurity moments is absent. For weak disorder the screening persists, but with the critical non-Fermi-liquid behaviors of the magnetic susceptibility and specific heat. A comparison with the disordered Kondo effect experiments in dirty metallic alloys is performed.
Klümper Andreas
Zvyagin Andrei
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