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Neutron polarization analysis on the multiferroic TbMn2O5 |
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| Authors: | LJ Chang Y Su W Schweika Th Brückel YY Chen DS Jang RS Liu |
| Institution: | a Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu 30013, Taiwan b Jülich Centre for Neutron Science (JCNS), Institut für Festkörperforschung, Forschungszentrum Jülich, Outstation at FRM-II, Lichtenbergstrasse 1, D-85747 Garching, Germany c Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany d Institute of Physics, Academia Sinica, Nankang Taipei 115, Taiwan e Department of Chemistry and Center for Nano Storage Research, National Taiwan University, Taipei 106, Taiwan |
| Abstract: | Polycrystalline TbMn2O5 was prepared by the standard solid-state reaction method and characterized by powder X-ray diffraction and magnetization to assure it is of single phase. Heat capacity measurements on the compound reveal an antiferromagnetic phase transition at  45 K. A broad peak below 6 K in the heat capacity measurements corresponds to the crossover transition of Tb3+ ordering. To confirm these magnetic orderings, neutron powder diffractions on TbMn2O5 with XYZ neutron polarization analysis were performed at the diffuse neutron scattering (DNS) spectrometer, FRJ-II, by using neutron wavelength of 4.8 Å in the temperature range of 1.8–250 K. Magnetic scattering was separated from nuclear coherent and spin incoherent scattering contributions. Long-range ordered magnetic peaks were observed below 39 K which is consistent with the heat capacity results. The drastic increasing intensities below 6 K indicate the ferromagnetic transition in Tb3+ orderings. |
| Keywords: | Multiferroics Neutron diffraction Specific heat |
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