Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Correlated Electrons: Frustrated Magnets - Cu-based Systems & FeCr
TT 42.13: Vortrag
Mittwoch, 9. März 2016, 12:45–13:00, H18
Spin relaxation processes in Cr1−xFex — •S. Säubert1,3, P. Schmakat2,3, J. Kindervater1, G. Benka1, A. Bauer1, J. N. Wagner4, W. Häussler3, O. Holderer3, S. M. Shapiro5, C. Pfleiderer1, and P. 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 below a doping dependent freezing temperature Tf. In contrast to a classical spin glass, the ground state changes from antiferromagnetic to ferromagnetic order with increasing iron concentration x [1, 2].
We report a study of the spin relaxation processes by means of neutron spin echo, magnetisation measurements and neutron depolarisation imaging for a wide range of concentrations x. This allows us to compare the relaxation process depending on the particular state at high temperatures. Our measurements provide an unprecedented combination of microscopic information on the spin dynamics and spin freezing on multiple length and time scales.
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