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2014 | 125 | 3 | 737-740
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Positron Annihilation Study of Defects in the Cage-Type Uranium Compound

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The electron and positron properties of the UIr_2Zn_{20} compound of the Fd-3m cage-type crystal structure are studied. The characteristics for the perfect crystal are compared with their counterparts in the elements containing Ir and Zn vacancy. The presence of the vacancy hardly influences the electron charge density around individual atoms. In contrast to electrons, the positron is strongly localized inside the vacancy and the transfer of positron charge is observed. The positron lifetime, τ, appears to be strongly sensitive to the presence and type of the vacancy. Furthermore, this parameter calculated for the perfect crystal is very close to the experimental value for Zn. Here the theoretical values of τ depend on the approach applied to the electron positron (e-p) correlations.
  • W. Trzebiatowski Institute of Low Temperatures and Structure Research, Polish Academy of Sciences P.O. Box 1410, 50-950 Wrocław 2, Poland
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