Regensburg 2004 – wissenschaftliches Programm

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M: Metallphysik

M 18: Postersitzung

M 18.7: Poster

Dienstag, 9. März 2004, 14:30–16:30, Saal C

A relativistic description for the positron annihilation in solids — •Diana Benea¹, Zsuzsanna Major², and Hubert Ebert¹ — ¹Department Chemie / Physikalische Chemie, Universität München, Butenandstr. 5-13, D-81377 München, Germany — ²H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL Bristol, UK

A fully relativistic formulation for the of spin resolved momentum density is presented together with a corresponding scheme to determine the two dimensional projection of the electron-positron momentum density for metals. This formalism is set up within the framework of spin-polarised relativistic Korringa-Kohn-Rostoker (SPR-KKR) method of bandstructure calculations. The resulting two dimensional projection of the electron-positron momentum density is usually identified with the two-dimensional angular correlation of the annihilation radiation (2D-ACAR) experimental spectra. Various two dimensional projections of the electron-positron momentum density of vanadium are presented and compared with nonrelativistic LMTO calculation and experimental data.