Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 13: Spinstructures and magnetic Phase Transitions
MA 13.12: Talk
Tuesday, March 27, 2007, 13:00–13:15, H5
Magnetostriction in high pulsed magnetic fields — •Wolfram Lorenz1, Nadejda Kozlova2, Jos Perenboom3, Mathias Doerr1, and Michael Loewenhaupt1 — 1TU Dresden, D-01062 Dresden — 2IFW Dresden, Helmholtzstraße 20, D-01069 Dresden — 3Radboud University Nijmegen, 6525 ED Nijmegen
Measurements of the magnetostriction complement very well the set of experimental methods in high pulsed magnetic fields. It allows not only to examine the interaction of magnetic moments with each other but also with the lattice system. Nowadays pulsed magnets with up to 100 T are under development, for which magnetostriction is a promising experimental method.
To measure magnetostriction up to the highest available fields a special capacitive dilatometer has been developed. It yields a high resolution of magnetostrictive effects (∼ 10−5 in Δl/l) in magnetic fields up to 50 T and at temperatures down to 2 K. Its special design reduces the influence of eddy currents and mechanical vibrations.
First experiments with this setup have been made on the rare earth compounds GdSi and SmCu2 that show transitions at 20 T and 30 T, respectively. Our data are in excellent agreement with measurements done in static fields (Bitter-magnet). We could verify the spin-flop character of the transition of GdSi. For SmCu2 the magnetic phase diagram has been constructed, which shows clear indication for a temperature dependent compensation of its spin and orbital momentum.
In this talk the measuring setup and first experimental results will be presented.