Magnetic and Neutron Diffraction Studies of the Polycrystalline and Nanoparticle TbMnO_3

• Authors: W. Bażela , M. Dul , V. Dyakonov , Ł. Gondek , A. Hoser , J. Hoffmann , B. Penc , A. Szytuła , Z. Kravchenko , I. Nosalev , A. Zarzycki
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

75.40.Cx; 75.47.Lx; 75.25.-j; 75.50.Ee

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: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 2
• Pages: 384-390

Dates

published

2012-08

Contributors

author

W. Bażela

• Institute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland

author

M. Dul

• Institute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland

author

V. Dyakonov

• 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

Ł. Gondek

• Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland

author

A. Hoser

• Helmholtz-Zentrum Berlin für Materialen and Energie GmbH, Hahn-Meitner-Platz 1, 14-109 Berlin, Germany

author

J. Hoffmann

• Helmholtz-Zentrum Berlin für Materialen and Energie GmbH, Hahn-Meitner-Platz 1, 14-109 Berlin, Germany

author

B. Penc

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

author

A. Szytuła

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

author

Z. Kravchenko

• A.A. Gałkin Donetsk Physico-Technical Institute, NANU, R. Luxemburg 72, 83114 Donetsk, Ukraine

author

I. Nosalev

• A.A. Gałkin Donetsk Physico-Technical Institute, NANU, R. Luxemburg 72, 83114 Donetsk, Ukraine

author

A. Zarzycki

• H. Niewodniczański Institute of Nuclear Physics, PAS, E. Radzikowskiego 152, 31-342 Kraków, Poland

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Identifiers

DOI

10.12693/APhysPolA.122.384