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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.43: Poster
Freitag, 20. März 2020, 09:00–12:00, P2/EG
Temperature dependent, spin-resolved measurements of the electronic structure of Gd — •Josef Ketels1, Michael Leitner2, and Christoph Hugenschmidt1,2 — 1Physik Department E21, Technische Universität München, 85748 Garching, Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany
The ferromagnetic rare earth metal gadolinium crystallizes in the hexagonal closed package structure. It is the only rare earth metal ordering ferromagnetically near room temperature with a Curie temperature of 294 K. At TSR≈ 230 K a spin reorientation transition occurs, turning the magnetic moment axis away from the c-axis below TSR [1]. The measurement of the two dimensional angular correlation of positron annihilation radiation (2D-ACAR) is a powerful tool to investigate the bulk electronic structure. Based on the spin-polarization of the positrons from a 22Na source, the minority and majority spin-channels can be determined separately. We present recent temperature dependent and spin-resolved 2D-ACAR measurements on Gd, probing the electronic structure at 0 K, 260 K and 305 K.
[1] J. W. Cable and E. O. Wollan, Phys. Rev. 165, 733 (1968)