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This paper reports on investigations of magnetic properties, crystal and magnetic structures on TbMnO_3 prepared in various ways, namely, as conventional polycrystalline sample and two nano particle specimens (synthesized with a sol-gel method at temperatures of 800 and 850°C). The X-ray and neutron diffraction data confirm the orthorhombic crystal structure (space group Pbnm, No. 62) without noticeable differences of the lattice parameters for poly- and nanocompounds. For the polycrystalline sample, a subsequent ordering of the Mn and Tb sublattices with decreasing temperature was observed. Namely, the Mn sublattice exhibits a modulated magnetic structure with the propagation vector k = (0, k_{x}, 0) in between 41-5 K. Below T = 21 K, a change from a collinear (A_{y} mode) into non-collinear (A_{y}G_{z} mode) structure was evidenced. Further decreasing of temperature below 10 K results in magnetic ordering of the Tb sublattice (modulated G_{x}A_{y}F_{z} mode). For nanoparticle compounds, magnetic ordering in the Mn and Tb sublattices is described by propagation vector k = (0, k_{y}, 0), with k_{y} components higher than observed for polycrystalline sample. The magnetic ordering in the Mn sublattice is described by a collinear A_{y} mode down to 1.6 K where the Tb moment becomes ordered (G_{x}A_{y} mode). The observed broadening of the Bragg peaks connected to the Tb sublattice suggests the cluster-like character of its magnetic structure.
Discipline
- 75.50.Ee: Antiferromagnetics
- 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
- 75.47.Lx: Magnetic oxides
- 75.25.-j: Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)(for devices exploiting spin polarized transport, see 85.75.-d)
Journal
Year
Volume
Issue
Pages
384-390
Physical description
Dates
published
2012-08
Contributors
author
- Institute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland
author
- Institute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland
author
- Institute of Physics, PAS, al. Lotników 32/46, 02-668 Warszawa, Poland
- A.A. Gałkin Donetsk Physico-Technical Institute, NANU, R. Luxemburg 72, 83114 Donetsk, Ukraine
author
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland
author
- Helmholtz-Zentrum Berlin für Materialen and Energie GmbH, Hahn-Meitner-Platz 1, 14-109 Berlin, Germany
author
- Helmholtz-Zentrum Berlin für Materialen and Energie GmbH, Hahn-Meitner-Platz 1, 14-109 Berlin, Germany
author
- M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
author
- M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
author
- A.A. Gałkin Donetsk Physico-Technical Institute, NANU, R. Luxemburg 72, 83114 Donetsk, Ukraine
author
- A.A. Gałkin Donetsk Physico-Technical Institute, NANU, R. Luxemburg 72, 83114 Donetsk, Ukraine
author
- H. Niewodniczański Institute of Nuclear Physics, PAS, E. Radzikowskiego 152, 31-342 Kraków, Poland
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Document Type
Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv122n2p56kz