[Zurück]

M. Rotter, M. Doerr, M. Zschintzsch, A. Lindbaum, H. Sassik, G. Behr:
"The magnetoelastic paradox in GdAg₂ and GdRu₂Si₂";
Journal of Magnetism and Magnetic Materials, 310 (2007), S. 1383 - 1385.

The magnetoelastic paradox in GdAg₂ and GdRu₂Si₂

M. Rotter a, M. Doerr b, M. Zschintzsch b, A. Lindbaum c, H. Sassik c and G. Behr d

a Institute for Physical Chemistry, University of Vienna, A-1090 Wien, Austria
b Fachbereich Physik, Technische Universität Dresden, D-01062 Dresden, Germany
c Institut f. Festkörperphysik, Technische Universität Wien, 1040-Wien, Austria
d Institut für Festkörper- und Werkstoffforschung Dresden, Dresden D-01171, Germany

Abstract

For isotropic systems the only source of magnetostriction is believed to be the exchange striction (ES). In many cases large magnetostrictive effects have been observed in Gd³⁺ based systems (S=7/2, L=0), but in no case a significant symmetry breaking lattice distortion has been found. For ferromagnetic (fm) order this is in line with the ES model. However, for antiferromagnetic (afm) large symmetry breaking distortions of the lattice are expected from theory. This contrasts to all available experimental data on several Gd-based antiferromagnets. We demonstrate examples for this magnetoelastic paradox and discuss in detail experimental evidence for GdAg₂ and GdRu₂Si₂.

Magnetostriction

http://dx.doi.org/10.1016/j.jmmm.2006.10.401