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Fermi-Surface Mapping from 2D Positron Annihilation Data

100%

Kontrym-Sznajd G., Samsel-Czekała M.

We demonstrate which kind of information on the electronic structure one can get from one-dimensional profiles, interpreted in terms of two-dimensional reconstructed densities. The conversion from one-dimensional to two-dimensional is applied to one-dimensional angular correlation of annihilation radiation profiles of divalent hexagonal close packed metals Mg and Cd. On the example of Mg we show that one should be very careful while studying the Fermi surface from electron-positron (e-p) densities folded into the first Brillouin zone.

Compton Scattering and Various ACAR Experiments in~Mg

88%

Kontrym-Sznajd G.

vol. 125

issue 3

696-699

Electron-positron (e-p) momentum densities in Mg are studied using three different sets of angular correlation of annihilation radiation (ACAR) and Compton scattering experimental data. ACAR data, measured with almost identical resolution, give both a similar anisotropy of the Fermi surface and a similar e-p enhancement factor inside this surface. However, as concerns a contribution of Umklapp components of valence-electron densities there are essential differences depending on experimental data. Due to a strong dependence of such densities on different theoretical approaches describing e-p correlations, it is suggested to perform additional, high statistics and resolution ACAR measurements for Mg and analyze them as suggested in the paper.

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2 Acta Physica Polonica A

1 2014

1 2005

2 Kontrym-Sznajd G.

1 Samsel-Czekała M.

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Fermi-Surface Mapping from 2D Positron Annihilation Data

Compton Scattering and Various ACAR Experiments in~Mg