Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Multiferroics

MA 38.9: Vortrag

Donnerstag, 26. März 2009, 17:30–17:45, HSZ 103

X-ray diffraction studies on multiferroic RMnO3 compounds in high magnetic fields — •Jörg Strempfer¹, Britta Bohnenbuck², Ioannis Zegkinoglou², Nadir Aliouane³, Dimitri N. Argyriou³, Alexander Krimmel⁴, and Martin von Zimmermann¹ — ¹HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany — ²MPI/FKF, Heisenbergstr. 1, Stuttgart, Germany — ³Helmholtz-Zentrum für Materialien und Energie, Glienicker Str. 100, Berlin, Germany — ⁴Experimentalphysik V, Universität Augsburg, Augsburg, Germany

Investigations of the multiferroic compounds TbMnO₃, DyMnO₃ and Y_0.2Eu_0.8MnO₃ by x-ray diffraction in high magnetic fields, oriented along the a and b-directions of the crystal, are presented. The relation of the behaviour of first and second harmonic reflections to changes in ordering of the rare earth moments in applied field for TbMnO₃ and DyMnO₃ is discussed [1-3]. Observations below the ordering temperature of the rare earth moments without and with applied magnetic field suggests a strong interaction of the rare earth moments, the Mn moments and the lattice. Since structural first harmonic reflections are absent in Y_0.2Eu_0.8MnO₃, these reflections in the other compounds reflect the ordering of the rare earth moments.

[1] N. Aliouane et al. Phys. Rev. B 73, 020102 (2006)

[2] J. Strempfer et al. Phys. Rev. B 75, 212402 (2007)

[3] J. Strempfer et al. Phys. Rev. B 78, 024429 (2008)