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Orbital magnetism in axially deformed sodium clusters

From scissors mode to dia-para magnetic anisotropy

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Abstract.

Low-energy orbital magnetic dipole excitations, known as the scissors mode (SM), are studied in alkali metal clusters. Subsequent dynamic and static effects are explored. The treatment is based on a self-consistent microscopic approach using the jellium approximation for the ionic background and the Kohn-Sham mean field for the electrons. The microscopic origin of SM and its main features (structure of the mode in light and medium clusters, separation into low- and high-energy plasmons, coupling high-energy M1 scissors and E2 quadrupole plasmons, contributions of shape isomers, etc.) are discussed. It is shown that the scissors M1 strength acquires large values with increasing cluster size. The mode is responsible for the van Vleck paramagnetism of spin-saturated clusters. Quantum shell effects induce a fragile interplay between Langevin diamagnetism and van Vleck paramagnetism and lead to a remarkable dia-para anisotropy in magnetic susceptibility of particular light clusters. Finally, several routes for observing the SM experimentally are discussed.

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Authors and Affiliations

  1. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia

    V. O. Nesterenko & W. Kleinig

  2. Institut für Analysis, Technische Universität Dresden, 01062, Dresden, Germany

    W. Kleinig

  3. Institut für Theoretische Physik, Universität Erlangen, 91058, Erlangen, Germany

    P.-G. Reinhard

  4. Dipartimento di Scienze Fisiche, Università di Napoli “Federico II”, Istituto Nazionale di Fisica Nucleare, Monte S. Angelo, Via Cinthia, 80126, Napoli, Italy

    N. Lo Iudice

  5. Departamento de Fisica, Universidade Federal de Santa Catarina, SC 88040-900, Florianópolis, Brazil

    F. F. de Souza Cruz & J. R. Marinelli

Authors
  1. V. O. Nesterenko
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  2. W. Kleinig
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  3. P.-G. Reinhard
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  4. N. Lo Iudice
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  5. F. F. de Souza Cruz
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  6. J. R. Marinelli
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Corresponding author

Correspondence to V. O. Nesterenko.

Additional information

Received: 20 December 2002, Published online: 29 July 2003

PACS:

36.40.-c Atomic and molecular clusters - 36.40.Cg Electronic and magnetic properties of clusters - 36.40.Gk Plasma and collective effects in clusters - 36.40.Vz Optical properties of clusters

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Nesterenko, V.O., Kleinig, W., Reinhard, PG. et al. Orbital magnetism in axially deformed sodium clusters. Eur. Phys. J. D 27, 43–53 (2003). https://doi.org/10.1140/epjd/e2003-00234-2

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  • DOI: https://doi.org/10.1140/epjd/e2003-00234-2

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