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1

Magnetic Properties of the RCoSn (R=Tb-Er) and RRhGe (R=Ce, Nd) Compounds

100%

Bażela W., Leciejewicz J., Małetka K., Szytuła A., Zygmunt A.

Acta Physica Polonica A

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1994

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vol. 85

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issue 5

859-862

EN

Magnetic properties of orthorhombic RCoSn (R = Tb-Er) and RRhGe (R = Ce,Nd) (of the TiNiSi-type of crystal structure), were studied by magnetometric and neutron diffraction methods. All RTX compounds order antiferromagnetically at low temperatures. The magnetic structure of TbCoSn and HoCoSn is sine-wave-modulated with the wave vectors k_{1} = (0, 0.25, 0.11) and k_{2} = (0, 0.333, 0), respectively. The magnetic structures of CeRhGe and NdRhGe compounds are collinear (C mode). Magnetic moments of 1.4(2) and 2.0(2) μ_{B} localized respectively on Ce and Nd ions, are aligned along the a-axis.

2

Magnetic Properties of RRhGe (R = Dy and Tm) Compounds

86%

Bażela W., Hofmann M., Baran S., Penc B., Szytuła A., Zygmunt A.

Acta Physica Polonica A

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2000

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vol. 97

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issue 5

819-822

EN

The magnetic properties of the ternary intermetallic RRhGe (R = Dy and Tm) were investigated by magnetic and neutron diffraction measurements. These compounds crystallize in a TiNiSi-type orthorhombic structure and are antiferromagnets with the Néel temperature 20 K (R = Dy) and 6.2 K (R = Tm). The neutron diffraction data reveal that the magnetic order in TmRhGe is collinear with the magnetic unit doubled along the b-axis respective to the crystal one.

3

Influence of the Grain Size on the Magnetic Properties of TbMnO_{3}

59%

Bażela W., Dul M., Dyakonov V., Gondek Ł., Hoser A., Hoffmann J., Penc B., Szytuła A., Kravchenko Z., Nosalev I., Zarzycki A.

Acta Physica Polonica A

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2012

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vol. 121

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issue 4

785-788

EN

The magnetic properties including magnetic structure of poly and nano samples of TbMnO_{3} are determined. All the samples investigated are antiferromagnets. In these samples the Mn ad Tb moments order antiferromagnetically at different temperatures and form modulated magnetic structure described by the propagation vector k=(k_{x},0,0) with different value of k_{x} for the Mn and Tb sublattices. Comparison of the data for poly and nano samples indicates the decrease of the moment and increase of the k_{x} component of propagation vector in the nano specimens. The wide Bragg peak related to the Tb sublattice suggests that the magnetic order has the claster-like character. The magnetic moments value in both sublattices is smaller, whereas the k_{x} values are larger for nano samples.

4

Magnetic and Neutron Diffraction Studies of the Polycrystalline and Nanoparticle TbMnO_3

59%

Bażela W., Dul M., Dyakonov V., Gondek Ł., Hoser A., Hoffmann J., Penc B., Szytuła A., Kravchenko Z., Nosalev I., Zarzycki A.

Acta Physica Polonica A

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2012

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vol. 122

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issue 2

384-390

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.

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4 Acta Physica Polonica A

2 2012

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4 Bażela W.

4 Szytuła A.

3 Penc B.

2 Dul M.

2 Dyakonov V.

2 Gondek Ł.

2 Hoffmann J.

2 Hoser A.

2 Kravchenko Z.

2 Nosalev I.

2 Zarzycki A.

2 Zygmunt A.

1 Baran S.

1 Hofmann M.

1 Leciejewicz J.

1 Małetka K.

Magnetic Properties of the RCoSn (R=Tb-Er) and RRhGe (R=Ce, Nd) Compounds

Magnetic Properties of RRhGe (R = Dy and Tm) Compounds

Influence of the Grain Size on the Magnetic Properties of TbMnO_{3}

Magnetic and Neutron Diffraction Studies of the Polycrystalline and Nanoparticle TbMnO_3