Quantum Monte Carlo simulations of dilute and concentrated heavy-fermion systems

The effects of diluting the number of impurities in a periodic Anderson model of heavy-fermion (HF) compounds, is studied using a quantum Monte-Carlo method. The susceptibility and spin correlation functions are calculated and the compensation sum-rule for a singlet groundstate is discussed. The cal...

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Bibliographic Details
Published in:Solid state communications 1988-04, Vol.66 (4), p.343-346
Main Authors: Costi, T.A., Müller-Hartmann, E., Ulrich, K.A.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Narrow-band systems
intermediate-valence solids
Physics
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Summary:The effects of diluting the number of impurities in a periodic Anderson model of heavy-fermion (HF) compounds, is studied using a quantum Monte-Carlo method. The susceptibility and spin correlation functions are calculated and the compensation sum-rule for a singlet groundstate is discussed. The calculations confirm the singlet nature of the groundstate of dilute and concentrated HF systems. In concentrated systems, however, the moment suppression is substantially due to the development of antiferromagnetic correlations between the f-electrons. The energy scale for moment quenching is also discussed.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(88)90853-8