Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Magnetic Coupling and Spin Structures

MA 45.11: Vortrag

Donnerstag, 14. März 2013, 17:45–18:00, H10

Investigation of the electronic structure of Cr using the 2D-ACAR technique — •Hubert Ceeh¹, Josef-Andreas Weber¹, Michael Leitner², Christoph Hugenschmidt^1,2, Liviu Chioncel³, and Peter Böni¹ — ¹Technische Universität München, Physik Department E21, D-85748 Garching, Germany — ²FRM II, Technische Universität München, D-85747 Garching, Germany — ³University of Augsburg, Theoretical Physics III, D-86135 Augsburg, Germany

Almost all properties of a material are defined by its electronic structure. For a metal, the most important characteristic is the Fermi surface, defining the boundary between occupied and unoccupied states in reciprocal space. The traditional experimental method for studying the Fermi surface is the de Haas-van Alphen effect, which is limited to low temperatures, and therefore cannot be utilized for the study of paramagnetic Cr above the Néel temperature of Cr is 311 K. For this reason, we applied the 2D-ACAR (Angular Correlation of Positron Annihilation Radiation) technique to investigate the electronic structure of both, the paramagnetic and the anti-ferromagnetic phase of Cr. We present the key features of our 2D-ACAR spectrometer and discuss the measurements on the pure metal system Cr, which are also compared with first principle band structure calculations.
This project is funded by the Deutsche Forschungsgesellschaft (DFG) within the Transregional Collaborative Research Center TRR 80 “From electronic correlations to functionality”