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Positive muon spin depolarization in quenched aluminium dilute alloys

  • Trapping and Detrapping at Impurities and Defects
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Abstract

Aluminum dilute alloys (Al-0.047 at% Mg, Al-0.052 at% Cu and Al-0.051 at% Si) were quenched from 600‡ and 450‡C. The positive muon behavior in the quenched alloys has been studied. Three peaks (Peak I, II and III) are found. Peak I is due to the trapping and detrapping of positive muons at single impurity atoms. The muon spin depolarization rate at the trap in Peak I was found to be 0.36μsec−1. Peak II is connected to impurity clusters. Peak III is the trapping of muons at quenched-in vacancies. The depolarization rate at the trapping site was found to be 0.2μsec−1. The activation energy of the trapping rate was found to be 25 meV. As the quenched-in vacancies annealed out, the trapping rates decreased to near zero.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Faculty of Engineering, The University of Tokyo, Bunkyo-ku, 113, Tokyo, Japan

    M. Doyama, T. Hatano, T. Natsui & Y. Suzuki

  2. Department of Physics, Faculty of Science, The University of Tokyo Hongo, Bunkyo-ku, 113, Tokyo, Japan

    Y. J. Uemura & T. Yamazaki

  3. Lawrence Berkeley Laboratory, University of California, 94720, Berkeley, California, USA

    K. Crowe

  4. TRIUMF, University of British Columbia, V6T 2A3, Vancouver, B.C., Canada

    M. Doyama, T. Hatano, T. Natsui, Y. Suzuki, Y. J. Uemura, T. Yamazaki, J. H. Brewer & K. Crowe

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  1. M. Doyama
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  2. T. Hatano
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  3. T. Natsui
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  4. Y. Suzuki
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  5. Y. J. Uemura
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  6. T. Yamazaki
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  7. J. H. Brewer
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  8. K. Crowe
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Doyama, M., Hatano, T., Natsui, T. et al. Positive muon spin depolarization in quenched aluminium dilute alloys. Hyperfine Interact 17, 225–229 (1984). https://doi.org/10.1007/BF02065906

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  • DOI: https://doi.org/10.1007/BF02065906

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