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MA: Fachverband Magnetismus

MA 32: Spin Structures and Magnetic Phase Transitions

MA 32.2: Talk

Wednesday, March 18, 2015, 15:15–15:30, EB 202

Spin freezing and spin dynamics in the re-entrant spin glass Cr_1−xFe_x — •Steffen Säubert^1,3, 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

Cr_1−xFe_x 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