Dresden 2014 – scientific programme

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MI: Fachverband Mikrosonden

MI 8: Poster: Microanalysis and Microscopy

MI 8.2: Poster

Wednesday, April 2, 2014, 17:00–19:30, P4

Improved algorithm for the determination of the Fermi surface in correlated systems using positrons — •Josef Andreas Weber¹, Hubert Ceeh¹, Liviu Chioncel³, Christoph Hugenschmidt^1,2, Michael Leitner¹, and Peter Böni¹ — ¹Technische Universität München, Physik Department, Lehrstuhl E21, James-Franck-Straße, D-85748 Garching, Germany — ²Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz, Lichtenbergstraße 1, D-85748 Garching, Germany — ³University of Augsburg, Theoretical Physics III, D-86135 Augsburg, Germany

The two-dimensional measurement of the angular correlation of the positron annihilation radiation (2D-ACAR) is a powerful tool to investigate the electronic structure of materials. In order to extract the Fermi surface a reconstruction from the measured projections of the electron momentum density is necessary. We will present an improved algorithm taking into account the full symmetry of the problem and the experimental resolution. It is shown, that this procedure will facilitate the comparison between measured data and ab-initio calculations in correlated electron systems. This circumstance is demonstrated by the reconstruction of the Fermi surfaces of nickel and copper.