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Nonequivalent-orbitals model for dilute magnetic alloys: Formation of local moment

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Zeitschrift für Physik B Condensed Matter

Abstract

A model Hamiltonian which includes one localized-type and one extended-type orbitals has been constructed for a more realistic description of magnetic impurities in nonmagnetic metals. We have used a variational method to study the ground state of this Hamiltonian. Due to the Hund's rule type coupling, under favorable condition the extended-and the localized-type orbitals can be both singly occupied to form a triplet state which contributes significantly to the local moment. We found a continuous change of local moments between the exact solutions at both the atomic and the band limits. A new mechanism has been discovered which may produce a ferromagnetic polarization cloud around the local moment. If so, this may provide an answer for the giant-moments formation.

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Author notes

  1. K. A. Chao

    Present address: Department of Physics and Measurement Technology, University of Linköping, Linköping, Sweden

Authors and Affiliations

  1. Institut für Theoretische Physik II, Westfälische Wilhelms-Universität Münster, Steinfurter Strasse 107, D-4400, Münster, Federal Republic of Germany

    A. M. Oleś

  2. Department of Physics Faculty of Science, Kyoto University, 606, Kyoto, Japan

    K. A. Chao

Authors
  1. A. M. Oleś
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  2. K. A. Chao
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Leave of absence from the Institute of Physics, Jagellonian University, Cracow, Poland

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Oleś, A.M., Chao, K.A. Nonequivalent-orbitals model for dilute magnetic alloys: Formation of local moment. Z Physik B 35, 261–268 (1979). https://doi.org/10.1007/BF01319846

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  • DOI: https://doi.org/10.1007/BF01319846

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