Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 9: Anisotropy/Magnetoelasticity
MA 9.5: Talk
Monday, March 26, 2007, 18:15–18:30, H22
The Magnetoelastic Paradox — •Manuel Zschintzsch1, Dirk C. Meyer1, Günter Behr2, Jan Prokleska3, Herwig Michor4, Mathias Doerr5, Michael Loewenhaupt5, and Martin Rotter6 — 1ISP, TU Dresden, Germany — 2IFW, Dresden, Germany — 3Charles University, Prague, Czech Republic — 4TU-Wien, Austria — 5IFP TU-Dresden, Germany — 6IPC, Universität Wien, Austria
The Magnetoelastic Paradox [1] describes the difference between the low temperature magnetoelastic behavior of antiferromagnetic compounds and the theoretical predictions due to the spin interactions. While studying the behavior at an atomic scale it’s important to separate the different kinds of interactions, in our case domain effects, single ion contributions and spin interactions.
Accordingly our measurements were performed on antiferromagnetic Gd based compounds: Due to antiferromagnetism domains don’t have to be considered. Additionally Gd exhibits no magnetic orbital momentum. Thus, single-ion contributions to the magnetoelastic behaviour don’t occur. The alloying partners were chosen in a way that they have no, or only weak magnetic moments. All magnetoelastic effects which can be seen from our X-ray diffraction experiments can be attributed to spin interaction of Gd exclusively. We measured the temperature dependend lattice parameters and peakwidths in the temperature range of 15 to 300K. The experimentally determined absence of symmetry breaking distortions (no changes of peakwidth detected) at the Neel-temperature leads to the existence of the magnetoelastic paradoxon.
[1] M. Rotter et al. Europhys. Lett. 75, 160-166 (2006)