Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Spin Structures and Magnetic Phase Transitions
MA 32.2: Vortrag
Mittwoch, 18. März 2015, 15:15–15:30, EB 202
Spin freezing and spin dynamics in the re-entrant spin glass Cr1−xFex — •Steffen Säubert1,3, Georg Benka1, Jonas Kindervater1, Andreas Bauer1, Julia N. Wagner4, Wolfgang Häußler3, Olaf Holderer3, Stephen M. Shapiro5, Christian Pfleiderer1, and Peter Böni2 — 1Lehrstuhl für Topologie korrelierter Systeme, Technische Universität München, Garching, Germany — 2Lehrstuhl für Neutronenstreuung, Technische Universität München, Garching, Germany — 3Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — 4Karlsruher Institute for Technology, IAM-WK, Eggenstein-Leopoldshafen, Germany — 5Brookhaven National Laboratory, Department of Physics, Upton, USA
Cr1−xFex shows reentrant spin glass behaviour as the ground state changes from antiferromagnetic to ferromagnetic order with increasing iron concentration x [1, 2]. We report magnetisation measurements, neutron depolarisation imaging (NDI) and neutron resonance spin-echo (NRSE) spectroscopy for a wide range of concentrations x. Our measurements provide an unprecedented combination of microscopic information on the spin dynamics and spin freezing on multiple length and time scales.
[1] S. K. Burke et al., J. Phys. F: Met. Phys. 13 (1983) 45 1-470
[2] S. M. Shapiro et al., Phys. Rev. B 24 (1981), 6661