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Magnetic Properties of the Mn_5Si_3 Compound

100%
Leciejewicz J., Penc B., Szytuła A., Jezierski A., Zygmunt A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1193-1203
EN
The magnetic and powder neutron diffraction data indicate a complex magnetic structure of Mn_5Si_3. This compound has the hexagonal D8_8 crystal structure at room temperature. The Mn atoms occupy two nonequivalent sublattices. Two phase transitions, at 60 and 106 K, are observed. The first one is between a non-collinear AF1 and a collinear AF2 magnetic structure, the second one is between the collinear AF2 structure and a paramagnetic state. At 106 K the crystal structure changes from the hexagonal to the orthorhombic one. The values of the Mn magnetic moment in both structures were calculated by different ab initio methods. The results of the calculations are compared with the values of the Mn magnetic moment determined experimentally in this work and presented in the previous ones.
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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.
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Magnetic Properties of RCuGe (R=Pr, Nd, Gd, Tb, Dy, Ho, Er) Compounds

86%
Baran S., Leciejewicz J., Stüsser N., Szytuła A., Tomkowicz Z., Zygmunt A.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
271-275
EN
The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples. RCuGe compounds are antiferromagnets at low temperatures, with T_{N} ranging from 2.2 K for R = Pr to 17 K for R = Gd. The external magnetic field causes a change in the type of the magnetic ordering from antiferro- to ferromagnetic state. From the neutron diffraction data the magnetic structure of all RCuGe compounds are determined. In the case of ErCuGe below T_{N} an additional phase transition is observed. The obtained experimental data are discussed in terms of an exchange interaction of the RKKY-type and crystalline electric field.
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