jap banner
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

Journal of Applied Physics / Volume 101 / Issue 9 / PROCEEDINGS OF THE TENTH JOINT MMM/INTERMAG CONFERENCE / Electronic Structure, Itinerant Magnetism

J. Appl. Phys. 101, 09G524 (2007); http://dx.doi.org/10.1063/1.2713228 (3 pages)

Magnetic impurities in magic-number clusters

Ralph Skomski and D. J. Sellmyer

Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588 and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588

View MapView Map

(Received 31 October 2006; accepted 30 January 2007; published online 7 May 2007)

It is investigated how magnetic impurities modify the behavior of metallic clusters. Two complementary models are used, an s-d exchange model with a stable magnetic moment and a Hubbard-type Kondo model. The s-d and s-f interactions are modeled by a pointlike potential, as in the Ruderman-Kittel-Kasuya-Yosida approximation, but the perturbed levels are obtained by diagonalizing the interaction matrix rather than using perturbation theory. The spin polarization of the conduction electrons due to the magnetic impurities leads to a reduction of the highest occupied molecular orbital–lowest unoccupied molecular orbital splitting. A particularly interesting case is Pt, which is used in catalysis and whose well-delocalized 5d electrons are easily spin polarized by conduction electrons. Strikingly, the simplest realization of the Kondo effect is reproduced by an unrestricted Hartree-Fock approximation.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. PERTURBED ONE-ELECTRON STATES
  3. KONDO EFFECT
  4. CONCLUSIONS

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

platinum, metal clusters, magnetic impurities, RKKY interaction, magnetic moments, Hubbard model, Kondo effect, HF calculations, electron spin polarisation

PACS

  • 75.30.Hx

    Magnetic impurity interactions

  • 75.30.Et

    Exchange and superexchange interactions

  • 71.70.Gm

    Exchange interactions

  • 75.30.Mb

    Valence fluctuation, Kondo lattice, and heavy-fermion phenomena

  • 75.20.Hr

    Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions

  • 75.30.Cr

    Saturation moments and magnetic susceptibilities

  • 75.10.Lp

    Band and itinerant models

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2713228

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.

    References

    S. M. Reimann, M. Koskinen, H. Häkkinen, P. E. Lindelof, and M. Manninen, Phys. Rev. B 56, 12147 (1997).

    X. G. Gong and V. Kumar, Phys. Rev. Lett. 70, 2078 (1993).

    S. N. Khanna, B. K. Rao, and P. Jena, Phys. Rev. Lett. 89, 016803 (2002).

    E. Janssens, S. Neukermans, H. M. T. Nguyen, M. T. Nguyen, and P. Lievens, Phys. Rev. Lett. 94, 113401 (2005).

    L. M. Falicov and R. A. Harris, J. Chem. Phys. 51, 3153 (1969)JCPSA6000051000008003153000001.


Figures (5)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)



Close

Google Calendar

ADVERTISEMENT

Your Recent History Recent History Help

Recently Viewed

  1. Magnetic impurities in magic-number clusters
Go to AIP Home   © AIP Publishing LLC
close