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Symmetry-dependent Mn-magnetism in Al 69.8 Pd 12.1 Mn 18.1

Author

Listed:
  • D. Rau
  • J. L. Gavilano
  • C. Beeli
  • J. Hinderer
  • E. Felder
  • G. A. Wigger
  • H. R. Ott

Abstract

We investigated the stability of magnetic moments in Al 69.8 Pd 12.1 Mn 18. 1 . This alloy exists in both, the icosahedral (i) and the decagonal (d) quasicrystalline form. The transition from the i- to the d-phase is achieved by a simple heat treatment. We present the results of measurements of the 27 Al NMR-response, the dc magnetic susceptibility, and the low-temperature specific heat of both phases. In the icosahedral compound, the majority of the Mn ions carries a magnetic moment. Their number is reduced by approximately a factor of two by transforming the alloy to its decagonal variety. For both compounds, we have indications for two different local environments of the Al nuclei. The first reflects a low density of states of conduction electrons and a weak coupling of the Al nuclei to the Mn-moments. The second type of environment implies a large d-electron density of states at the Fermi level and a strong coupling to the magnetic Mn moments. Spin-glass freezing transitions are observed at T deca f =12 K for the decagonal, and T ico f =19 K for the icosahedral phase. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • D. Rau & J. L. Gavilano & C. Beeli & J. Hinderer & E. Felder & G. A. Wigger & H. R. Ott, 2005. "Symmetry-dependent Mn-magnetism in Al 69.8 Pd 12.1 Mn 18.1," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 46(2), pages 281-287, July.
    • Handle: RePEc:spr:eurphb:v:46:y:2005:i:2:p:281-287
    DOI: 10.1140/epjb/e2005-00245-9
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