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1
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Band Gap Stability in Kondo Insulators

100%
Ślebarski A., Jezierski A., Zygmunt A.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 1
59-70
EN
We report on magnetic measurements and electronic structure investigations of CeNiSn and CeRhSb. Both belong to the group of Kondo insulators. The magnetic susceptibility shows the nonmagnetic ground state for these compounds and their alloys. The 3d X-ray photoemission spectroscopy spectra show evidence for the mixed valence state of Ce in CeRhSb alloys, as also seen for CeNiSn, whereas the spectra for the La substituted (Ce,La)NiSn compounds show only evidence for a pure Ce^{3+} ground state. We suggest the presence of Kondo-hole states in (Ce,La)RhSb. The location of the pseudogap in CeRhSb varies with the number of free electron, the valence of Ce, and the f-d hybridization. We discuss the similar crystallographic properties and the closed electronic structures of ZrNiSn-type semi-Heusler alloys and CeNiSn-type Kondo insulators.
2
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Susceptibility of the Rare Earth Ternary RNiSi_{2} and RNiGe_{2} Compounds

88%
Gil A., Szytuła A., Tomkowicz Z., Wojciechowski K., Zygmunt A.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
271-274
EN
The ternary silicides and germanides RNiX_{2} (R - rare earth, X = Si or Ge) with the orthorhombic CeNiSi_{2}-type structure are investigated by magnetometric measurements. CeNiSi_{2}, CeNiGe_{2} and SmNiGe_{2} have a nonmagnetic state in low temperatures. The compounds with R = Pr and Nd are ferromagnets while those containing R = Gd-Er are antiferromagnets. The de Gennes scaling of the Néel temperatures indicates a strong influence of the crystalline-electric field effects.
3
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Magnetic Properties of the Mn_5Si_3 Compound

88%
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.
4
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Magnetic Properties of the RCoSn (R=Tb-Er) and RRhGe (R=Ce, Nd) Compounds

88%
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.
5
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Magnetic Properties of RCuGe (R=Pr, Nd, Gd, Tb, Dy, Ho, Er) Compounds

76%
Baran S., Leciejewicz J., Stüsser N., Szytuła A., Tomkowicz Z., Zygmunt A.
Acta Physica Polonica A
|
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.
6
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Magnetic Behaviour and Electronic Structure of the R_{2}PdSi_{3} (R = Ce, Nd, Tb-Er) Compounds

76%
Szytuła A., Hofmann M., Penc B., Ślaski M., Majumdar S., Sampathkumaran E., Zygmunt A.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
823-826
EN
The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples of R_{2} PdSi_{3} (R = Ce, Nd, Tb-Er). In Ce_{2}PdSi_{3} the Ce moments order below 2.5 K. The Nd magnetic moments in Nd_{2}PdSi_{3} exhibit ferromagnetic ordering below 17 K. In Tb_{2}PdSi_{3}, a complex situation is observed: in the temperature range from 1.5 K to (T_{N}=25 K), there is a coexistence of a ferromagnetic spiral (about 75% of the magnetic moment) and a spin-glass (about 25%). For the Dy, Ho, and Er compounds, below T_{N} (7.5, 8, and 7 K respectively), sinusoidally modulated structures are observed. The valence band and the core level photoemissions of 4d of rare-earth metal, 3d Pd, 2s and 2p Si were investigated by X-ray photoemission spectroscopy measurements.
7
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Magnetic Properties of RRhGe (R = Dy and Tm) Compounds

76%
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.
8
Content available remote

Magnetic Structure of RNiGe and RPdSn Compounds

64%
André G., Bourée F., Bombik A., Oleś A., Sikora W., Kolenda M., Szytuła A., Pacyna A., Zygmunt A.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
275-278
EN
Magnetic properties including magnetic structure of ternary RNiGe (R = Tb-Er) and RPdSn (R = Ce, Tb-Ho) compounds are determined. In low temperatures an antiferromagnetic ordering is observed. For compounds with R = Tb-Er the magnetic structure changes with temperature.
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