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Fermi Surface Studies in Disordered Alloys: Positron Annihilation Experiments

  • S. Berko
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 42)

Abstract

In these lectures we shall outline the use of the positron (e+) annihilation technique for the study of electrons (e-) in metals and, in particular, in non-dilute disordered alloys. The behavior of slow e+-s in condensed matter has been the subject of intense experimental and theoretical investigations during the last two decades, and the field has been reviewed thoroughly;1 positron annihilation has become a useful new tool in solid state physics. By studying the various properties of annihilation quanta one obtains direct information about the electrons the positrons annihilate with. In particular the 2γ angular correlation of annihilation radiation (ACAR) reflects, by momentum conservation, the momentum density of the annihilating e+-e-pair. Discontinuities in the correlation curves can be used to mea-sure the size and shape of the Fermi surface (FS) in pure metals as well as in alloys. If the behavior of the e+ is sufficiently well understood and the effect of the e+-e- Coulomb interaction sufficiently well accounted for, the ACAR measurements can lead, as we shall see, to a test of the electronic wavefunctions of the system under investigation.

Keywords

Momentum Density Coherent Potential Approximation Compton Profile Random Alloy Disorder Alloy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • S. Berko
    • 1
  1. 1.Physics DepartmentBrandeis UniversityWalthamUSA

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