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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.51: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Critical magnetic fluctuations in Heisenberg antiferromagnets — •Kuo Feng Tseng1, Andrew Walters1, Thomas Keller1,2, Sibel Bayrakci1, and Bernhard Keimer11Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany — 2Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), D-85747 Garching, Germany

We have performed elastic and inelastic neutron scattering measurements in classical Heisenberg antiferromagnets MnF2 (3D) and Rb2MnF4 (2D) with a Néel temperature TN of 67.4 and 38.4 K respectively. We utilized high resolution spin-echo and Larmor diffraction techniques at the TRIple axis resonance SPin echo spectrometer (TRISP). By appropriately choosing field geometries at TRISP, we are able to separate the longitudinal and transverse correlations of the critical fluctuations close to TN with the advantages of neutron ray-tracing method. Determinations of the longitudinal and transverse linewidths (=inverse lifetime) on MnF2 and Rb2MnF4 were obtained at TRISP with extremely high resolution in a micronelectron-volt range. The results and technique open up a new avenue for a re-investigation of underlying physics in the critical phenomena.

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DPG-Physik > DPG-Verhandlungen > 2014 > Dresden