Effect of the Positron Distribution on the Electron-Positron Momentum Density Calculated for SiC
A. Rubaszek
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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Received: 3 09 2007;
To interpret positron annihilation data in solids in terms of the electron momentum density, both the electron-positron interaction and positron distribution have to be considered explicitly. In the present work the influence of the shape of the positron wave function on the calculated electron-positron momentum density in elemental SiC is discussed. It is shown that the form of the positron distribution in the Wigner-Seitz cell has a considerable effect on the resulting annihilation characteristics. Calculations were performed for SiC of 3C diamond structure within the linear muffin-tin orbital-atomic spheres approximation method.
DOI: 10.12693/APhysPolA.113.1501
PACS numbers: 78.70.Bj, 71.15.Ap, 71.20.Mq