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Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 2: Multiferroics 1 (jointly with DF, DS, KR, and MA)

TT 2.3: Talk

Monday, March 11, 2013, 10:00–10:15, H3

Investigation of magnetic ordering in Eu1−xYxMnO3 using full polarization analysis at P09 beamline — •Arvid Skaugen, Dinesh K. Shukla, Helen Walker, Sonia Francoual, and Jörg Strempfer — Deutsches Elektronen-Synchrotron, Harmburg, Germany

Varying multiferroic properties with strong ME coupling have been reported for Eu1−xYxMnO3 [1]. The crystal structure of Eu1−xYxMnO3 is similar to the one of TbMnO3 with comparable lattice distortions. However, the effect of rare earth magnetism is eliminated since Eu3+ (4f6) and Y3+ (4f0) ions both are non-magnetic. The compound Eu0.8Y0.2MnO3 first shows a phase transition at TN = 45K from a paramagnetic to an antiferromagnetic and paraelectric state with a presumably sinusoidal collinear AFM structure, in analogy to TbMnO3. At TC = 30K the magnetic structure changes to weak ferromagnetism, attributed to a cone-like structure that breaks inversion symmetry and gives rise to ferroelectricity with the polarization along the a-axis.

We have investigated Eu0.8Y0.2MnO3 using resonant x-ray diffraction as function of temperature, magnetic field and incident polarization at beamline P09 at PETRA III. The method of full polarization analysis has been used to investigate the different resonances showing up at the Mn K-edge. From the polarization scans, it is possible to draw conclusions on the complex magnetic order. Preliminary results suggest a helicoidal SDW structure of the Mn moments rather than a cone-like structure.

[1] J. Hemberger et al., Phys. Rev. B 75, 035118 (2007)

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