Münster 1997 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
AM: Magnetismus
AM 9: Postersitzung Fürstenberghaus
AM 9.22: Poster
Tuesday, March 18, 1997, 09:30–12:30, F"u
Correlation Lenghts and Lineshapes of Magnetic Fluctuations in EuS near TC — •D. Görlitz1, P. Böni2, M. Hennion3, J. Kötzler1, J. L. Martínez4, B. Roessli5, and W. Schmidt5 — 1Institut für Angewandte Physik, Universität Hamburg, D-20355 Hamburg, Deutschland — 2Labor für Neutronenstreuung ETH & PSI, CH-5232 Villigen PSI, Schweiz — 3Laboratoire Léon Brillouin, CE-Saclay, F-91191 Gif-sur-Yvette Cedex, France — 4Consejo Superior de Investigaciones Cientificas, E-28049 Madrid, Spain — 5Institut Laue Langevin, F-38042 Grenoble Cedex, France
We have measured the dynamics of spin fluctuations along the magnetization direction below TC and along the direction of propapagtion above TC in the dipolar regime by means of inelastic scattering of polarized neutrons near the 200-Bragg reflection. In both cases the response is quasielastic. The correlation length below TC are obtained by energy- integration of the scattered intensity. The results are contrasted to unpolarized work [1]. The lineshape above TC, measured in detail at very large energy transfer with higher resolution than in previous work [2], is found to be in excellent agreement with mode-coupling theory [3].
[1] J. Als-Nielsen et al., Phys.Rev. B14, 4908 (1976)
[2] D. Görlitz et al., Physica B 180&181, 214 (1992)
[3] E. Frey et al., Phys.Rev. B40, 7199 (1989)