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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 Böni21Lehrstuhl 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

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