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1
Content available remote

Manganites - Structural Aspects

100%
Szytuła A.
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issue 2
303-306
EN
In the work a brief discussion of the structural and magnetic properties of the manganites from the point of view of the micro- and macrostructures is presented. The influence of stoichiometry with the different oxygen parameter δ and doped atoms is discussed. The correlation between the crystal structure parameters and magnetic properties for some manganites is presented.
2
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Magnetic and Related Properties of Ternary TmTX Intermetallics

64%
Kaczorowski D., Szytuła A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
620-622
EN
We report on the magnetic and thermal properties of a few TmTX compounds, where T = d-electron metal and X = p-electron element. In all these ternaries but TmRuGe the thulium magnetic moments order antiferro- or ferromagnetically at low temperatures. The specific heat data confirms the magnetic orderings and reveals the influence of crystalline electric field effects.
3
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Magnetic Properties and Magnetocaloric Effect οf R_{1-x}R'_{x}Mn_{2}Ge_{2} Compounds

64%
Duraj M., Szytuła A.
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issue 4
603-606
EN
The magnetic and magnetocaloric properties of Sm_{1-x}Gd_{x}Mn_{2}Ge_{2} compounds with 0 ≤ x ≤ 0.10 have been studied. SmMn_{2}Ge_{2} is antiferromagnetic below the Néel temperature T_{N} ( ≈ 400 K). Further cooling leeds to canted ferromagnetic phase below T_C = 341 K. With decreasing temperature, two metamagnetic phase transitions are observed: F2-AF1 at T_2 = 153 K and AF1-F1 at T_1 = 106 K. The maximum values of magnetic entropy change | Δ S_m | are found to be 1.5 J K^{-1} kg^{-1} at T_{1} and 2.0 J K^{-1} kg^{-1} at T_{2} in SmMn_{2}Ge_{2}. The MCE is found to increase with Gd concentration, | Δ S_{m}(T_{1}) | = 3.3 J K^{-1} kg^{-1}, while | Δ S_{m}(T_{2})| is slightly enhanced for x = 0.1. The magnetocaloric effect is found to be positive at T_{1} and negative at T_{2}.
4
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Electronic Structure and Optical Properties of Ce_{1-x}La_xPtIn (0

64%
Jezierski A., Szytuła A.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1
109-112
EN
The electronic structure of Ce_{1-x}La_{x}PtIn is studied by means of ab initio full-potential local orbital basis (coherent potential approximation) (FPLO-CPA) and spin polarized relativistic Korringa-Kohn-Rostoker (SPR-KKR-CPA) methods within the densities functional methodologies. In both methods, we have observed decrease of the density of states at the Fermi level versus of La concentration. The theoretical photoemission spectra of LaPtIn and CePtIn are compared with the experimental data and the agreement is good. We have also reported the optical properties of LaPtIn and CePtIn compounds obtained in GGA and GGA+U approximation.
5
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Magnetic Properties of RIrSi (R = Tb, Dy, and Ho) Compounds

64%
Duraj R., Szytuła A.
Acta Physica Polonica A
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2013
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vol. 123
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issue 4
773-776
EN
The magnetic data for the polycrystalline samples of RIrSi (R = Tb, Dy and Ho) compounds are reported. These compounds are antiferromagnets with the Néel temperatures equal to 32 K (R = Tb), 7.0 K (R = Dy) and 4.8 K (R = Ho), respectively. The external magnetic field induces the one step for TbIrSi and two step for DyIrSi and HoIrSi metamagnetic phase transitions. The values of the critical field as Néel temperatures decrease with increase of the number of 4f electrons. The magnetic phase diagrams (H, T) are determined.
6
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Influence of Local Environment on the Electronic Structure and Magnetic Properties of Ni_{1-x}Cu_{x}MnSb Alloys

64%
Jezierski A., Szytuła A.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
607-610
EN
The magnetic ordering in Ni_{1-x}Cu_{x}MnSb alloys changes from ferromagnetic (x=0) to antiferromagnetic (x=1). The X-ray and neutron diffraction showed that the systems crystallise in C1_{b} type structure. We present an influence of the local chemical ordering on the electronic and magnetic properties of Ni_{1-x}Cu_{x}MnSb alloys. The band structure and the magnetic moments were calculated by the spin-polarised linear muffin-tin orbital in the atomic sphere approximation method for the experimental values of the lattice parameters. The magnetic moment of Mn increases from 3.8 μ_{B} for x=0 to 4.18 μ_{B} for x=1.
7
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Magnetic Properties and the Magnetic Phase Transitions in R_5Rh_4Ge_{10} (R = Tb-Tm) Compounds

64%
Duraj R., Szytuła A.
Acta Physica Polonica A
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2013
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vol. 123
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issue 1
139-144
EN
The magnetic data for R_5Rh_4Ge_{10} (R = Tb, Dy, Ho, Er, and Tm) compounds was investigated by means of the dc magnetization and dc and ac magnetic susceptibility. At low temperature all these compounds are antiferromagnets. For these with R = Tb, Ho and Er below T_{N} the additional phase transitions are observed. The obtained data are compared with the neutron diffraction results.
8
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Magnetic Properties of Tb_{1 - x}Y_{x} NiIn System

64%
Zarzycki A., Szytuła A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
382-383
EN
Polycrystalline samples of Tb_{1 - x}Y_{x}NiIn (x = 0.2 and 0.4) were prepared and studied by powder X-ray diffraction and AC and DC magnetic measurements. The compounds crystallize in the hexagonal ZrNiAl-type structure. At low temperatures the ferromagnetic properties are detected. With increasing Y content a change in the magnetic properties, decrease of the Curie temperatures and magnetic moment in the ordered state are observed.
9
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Complex Magnetic Behaviour of Ho_3Cu_4X_4 Compounds (X = Si and Sn)

52%
Gondek Ł., Szytuła A., Prokhnenko O.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1179-1184
EN
Ternary Ho_3Cu_4X_4 compounds exhibit very complex magnetic phase diagrams. The rare earth ions occupy two non-equivalent crystal positions. Within both magnetic sublattices, magnetic moments exhibit different magnetic ordering temperatures. Moreover, in light of our results, it seems that both sublattices are weakly coupled between each other. This may be observed as independent changes of propagation vectors etc. The major difference of ordering temperatures between both compounds is likely related to substantial change of interatomic distances. Consequently, completely different crystalline electric field effects are observed.
10
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Magnetic Properties of the RT_{2}X_{2}, RTX_{2} and RTX Compounds in High Magnetic Fields

52%
Szytuła A., Ivanov V., Vinokurova L.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
293-296
EN
Magnetization curves up to 140 kOe have been measured in the temperature range 4.2-100 K on polycrystalline oriented samples for some RT_{2}X_{2}, RTX_{2} RTX compounds. The magnetic phase diagrams for all samples are determined.
11
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Mixed-Valence State in Yb_2CuGe_6

52%
Szytuła A., Penc B., Konyk M., Winiarski A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1205-1209
EN
We present here temperature dependent X-ray photoemission measurements on polycrystalline Yb_2CuGe_6. The analysis of these data shows the change in the effective valence, determined directly from the 4f intensity ratio, as a function of temperature.
12
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Electronic Structure of CePtIn and LaPtIn Compounds

52%
Jezierski A., Penc B., Szytuła A., Winiarski A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 1
212-215
EN
The electronic structure of the ternary RPtIn (R = La, Ce) compounds, which crystallize in the hexagonal ZrNiAl-type structure, was studied by X-ray photoelectron spectroscopy measurements and calculation using the ab initio methods (linear muffin-tin orbital in the atomic sphere approximation, full potential linear muffin-tin orbital, full potential linear orbital). The results showed that the valence band in these compounds is formed by the Pt 5d and In 5s and 5p states. The band calculations with spin-orbit coupling have shown that the Ce 4f peaks consist of two peaks above the Fermi level that correspond to the Ce 4 f_{7/2} and 4 f_{5/2} doublet and wide peaks corresponding to the La 4f states. The analysis of Ce 3d spectra on the basis of the Gunnarsson-Schönhammer model gives hybridization of 4f orbitals with the conduction electron band equal to 170 meV.
13
Publication available in full text mode
Content available

Spin Frustration in Some Magnetic Compounds

52%
Szytuła A., Gondek Ł., Penc B., Hernandez-Velasco J.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
583-591
EN
In the paper the results of the powder neutron diffraction measurements of RAuIn (R = Ce, Tb, Dy, and Er) and ZnFe_2O_4 compounds at low temperatures are presented. For the RAuIn compounds, which crystallize in the hexagonal ZrNiAl-type structure, the rare-earth moments lie in the ab-plane and form a typical triangle non-collinear structure. ZnFe_2O_4 has the normal spinel structure in which the Fe^{3+} ions occupy the B sites, forming the corner-shared tetrahedra of the Fe spins. At low temperatures experimental data indicate the coexistence of the long-range and the short-range magnetic order. The obtained results suggest that the important factor which influences the magnetic ordering in these compounds is geometrical frustration of magnetic moments.
14
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Evidence of the Non-Magnetic Ordering in TmRu₂Si₂ at Low Temperatures

52%
Szytuła A., Hoser A., Baran S., Penc B.
Acta Physica Polonica A
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2016
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vol. 130
|
issue 6
1371-1372
EN
The neutron powder diffraction measurements of the TmRu₂Si₂ compound in the temperature range 0.47-2.5 K have been performed. The obtained results confirm that this compound in low temperature has a tetragonal ThCr₂Si₂-type crystal structure (space group I4/mmm). The long range magnetic ordering was not detected up to 0.47 K.
15
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Magnetic Properties of Ho_{5}Ni_{2}In_{4}

52%
Tyvanchuk Y., Penc B., Szytuła A., Zarzycki A.
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|
issue 4
599-600
EN
X-ray diffraction and magnetic measurements of Ho_{5}Ni_{2}In_{4} are reported. This compound crystallizes in the orthorhombic Lu_{5}Ni_{2}In_{4}-type structure. Magnetic data indicate ferromagnetic properties below T_c = 30 K.
16
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Neutron Diffraction Studies of PrNi₅Sn

52%
Penc B., Hoser A., Szytuła A.
Acta Physica Polonica A
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2016
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vol. 129
|
issue 3
313-314
EN
Powder neutron diffraction measurements of PrNi₅Sn performed in the temperature range 1.5-76 K indicate that the compound crystallizes in a hexagonal CeNi₅Sn-type crystal structure (space group P6₃/mmc). The a lattice parameter and the unit cell volume V increase while the c lattice parameter does not change with increasing temperature. No long range magnetic ordering was detected down to 1.5 K, in contradiction to bulk magnetometric results.
17
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Content available

Magnetic Properties and Electronic Structure of CeTIn (T = Ni, Cu, Pd, Au) Compounds

52%
Szytuła A., Penc B., Gondek Ł.
Acta Physica Polonica A
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2007
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vol. 111
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issue 4
475-486
EN
The electronic structure of the ternary CeTIn (T = Ni, Cu, Pd, Au) compounds was investigated by means of X-ray photoelectron spectroscopy. Our interest was aimed mainly to the valence bands and the Ce3d core levels of investigated compounds. Analysis of the valence bands indicates that they are mainly determined by the Tnd band, whereas a share of the R4f states can be estimated to be about a few percent only. The analysis of the differential valence bands spectra between CeTIn and LaTIn analogues suggests that the Ce4f^1 ground states shift deeper below the Fermi level with an increase in the 4f level occupation factor. The analysis of the Ce3d spectra made on the basis of the Gunnarsson-Schönhammer model indicates the hybridization parameter equal to 148 meV for CeNiIn, 45 meV for CeCuIn, 177 meV for CePdIn, and 123 meV for CeAuIn.
18
Content available remote

Magnetic Structures of Ho_5Rh_4Ge_{10}

52%
Szytuła A., Penc B., Hofmann M., Sikora W.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
1002-1004
EN
A powder diffraction measurement of Ho_5Rh_4Ge_{10} is reported. This compound crystallizes in the tetragonal Sc_5Co_4Si_{10}-type structure (space group P4/mbm) in which the Ho atoms occupy three different sites. The neutron diffraction measurements indicate antiferromagnetic order with the Néel temperature T_{N}=7 K. Below T_{N} an additional phase transition at 4.5 K connected with the change of the magnetic structure is observed. The Ho moments in 4(h) site form collinear order up to T_{N} while moments at 2(a) site form sine modulated structure. Determined experimentally magnetic structures are compared to the results of symmetry analysis.
19
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Magnetic Properties of NdCo_{2}Si_{2}, TbCo_{2}Si_{2} and DyCo_{2}Si_{2} in High Magnetic Fields

52%
Ivanov V., Vinokurova L., Szytuła A.
Acta Physica Polonica A
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1992
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vol. 81
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issue 6
693-698
EN
The magnetic properties of RCo_{2}Si_{2} (R = Nd, Tb, Dy) compounds were studied by measuring the high-field magnetization in magnetic fields up to 140 kOe and over the temperature range 4.2-45 K. The magnetic field induces in NdCo_{2}Si_{2} three metamagnetic phase transitions and two transitions in TbCo_{2}Si_{2} and DyCo_{2}Si_{2} compounds.
20
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Magnetism and Specific Heat of TmRhX (X = Ga, Ge) Compounds

52%
Baran S., Przewoźnik J., Szytuła A.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
998-1001
EN
Magnetic and specific heat data of the TmRhX (X = Ga, Ge) compounds are reported. These compounds crystallize in an orthorhombic crystal structure of the TiNiSi-type (space group Pnma). Magnetic data indicate that the compounds are antiferromagnets with the Néel temperature T_{N} equal to 3.9 K for TmRhGa and 6.0 K for TmRhGe. Magnetic susceptibility of TmRhGe has an additional peak at T_{t} = 10.6 K. In TmRhGe temperature dependence of χ"(T), the positions of both the peaks at T_{N} and T_{t} change with frequency indicating a relaxation process. These data suggest that with the decreasing temperature, first a cluster glass state and next the long-range aniferromagnetic order exists.
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