EXACT MANY-BODY APPROACH TO MAGNETISM AND CLUSTER STRUCTURE

G.M. Pastor, R. Hirsch and B. Mühlschlegel
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G.M. Pastor: Institut für Theoretische Physik der Universität zu Köln, Zülpicher Straβe 77, 50937 Köln, Germany;
R. Hirsch: Institut für Theoretische Physik der Universität zu Köln, Zülpicher Straβe 77, 50937 Köln, Germany
B. Mühlschlegel: Institut für Theoretische Physik der Universität zu Köln, Zülpicher Straβe 77, 50937 Köln, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 447-451

Abstract: The magnetic and structural properties of small clusters havingN≤8atoms were determined rigorously in the framework of the Hubbard model by performing the exact many-body electronic calculations together with a complete geometry optimization. We discuss the resulting interplay between electron correlations, magnetism, and cluster structure atT=0, as well as the stability of cluster ferromagnetism against temperature-induced electronic excitation and structural changes.

Date: 1996
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DOI: 10.1142/S0218625X96000802

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