Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Poster Ib: Magnetic Materials (1-14); Micro Magnetism/Computational Mag. (15-17); Surface Magnetism (18-22); Spin Structures/Phase Transitions (23-25)

MA 14.7: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1B

Magnetism of La_0.875Sr_0.125MnO₃ studied by means of magnetometry and XMCD — •K. Kuepper¹, M. Raekers², C. Taubitz², M. Prinz², M. Uhlarz³, V.R. Galakhov⁴, Ya. M. Mukovskii⁵, and M. Neumann² — ¹University of Ulm, Department of Solid State Physics, Albert-Einstein-Allee 11, D-89069 Ulm, Germany — ²Department of Physics, University of Osnabrück, D-49069 Osnabrück, Germany — ³FZ Dresden-Rossendorf, Bautzner Landstr. 128, 01328 Dresden, Germany — ⁴Institute of Metal Physics, Russian Academy of Sciences, Ural Division, 620219 Yekaterinburg GSP-170, Russia — ⁵Moscow State Steel and Alloy Institute, 117936 Moscow, Russia

The manganites La_1−xSr_xMnO₃ exhibit a remarkable rich phase diagram as function of temperature, doping concentration and magnetic field, accompanied by attractive properties like colossal magneto resistance (CMR). Furthermore, La_0.875Sr_0.125MnO₃ shows an unusual ferromagnetic insulating (FMI) ground state which can not be explained by the conventional double exchange model. We studied the magnetic properties of a La_0.875Sr_0.125MnO₃ single crystal by means of temperature dependent magnetometry and applied x-ray circular magnetic dichroism (XMCD) at the Mn L_2,3 edges. In contrast to previous results reported [1] we do not find a significant Mn orbital moment, neither in the FMI phase (T < 180K) nor in the high temperature paramagnetic insulating phases (T > 180K).

[1] M. Platé et al., Phys. Rev. B 72, 085102 (2005).