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1
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Mixed-Valence State in Yb_2CuGe_6

100%
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.
2
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Electronic Structure of CePtIn and LaPtIn Compounds

100%
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.
3
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Spin Frustration in Some Magnetic Compounds

100%
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.
4
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Evidence of the Non-Magnetic Ordering in TmRu₂Si₂ at Low Temperatures

100%
Szytuła A., Hoser A., Baran S., Penc B.
Acta Physica Polonica A
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2016
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vol. 130
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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.
5
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Magnetic Properties of Ho_{5}Ni_{2}In_{4}

100%
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.
6
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Neutron Diffraction Studies of PrNi₅Sn

100%
Penc B., Hoser A., Szytuła A.
Acta Physica Polonica A
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2016
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vol. 129
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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.
7
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Magnetic Properties and Electronic Structure of CeTIn (T = Ni, Cu, Pd, Au) Compounds

100%
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.
8
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Magnetic Structures of Ho_5Rh_4Ge_{10}

100%
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.
9
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Size Effects in Antiferromagnetic NiO Nanoparticles

100%
Baran S., Hoser A., Penc B., Szytuła A.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1
35-39
EN
X-ray and neutron diffraction as well as magnetometric methods were used in order to investigate crystal and magnetic structure together with magnetic properties of nickel oxide NiO obtained from thermal decomposition of Ni(OH)₂. It has been found that crystal unit cell volume and crystal unit cell deformation parameter decrease with increasing decomposition temperature T_{d} while grain size increases. The results of magnetization, magnetic susceptibility and neutron diffraction measurements reveal a formation of antiferromagnetic order with uncompensated magnetic moment below the Néel temperature. Magnetization together with coercive field decreases with increasing T_{d}. The neutron diffractogram of sample obtained at 240°C indicates broadening of both the peaks of nuclear and magnetic origin. The magnetic ordering may be described by a propagation vector k=[½,½,½].
10
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Magnetic Properties and Magnetic Structure of DyCoSi_2 Compound

100%
Duraj R., Penc B., Szytuła A.
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vol. 125
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issue 5
1176-1178
EN
The results of new magnetic dc and neutron diffraction measurements of DyCoSi_2 compound are presented. Below T_{N} equal to 10.9 K the Dy moments form collinear G-type structure with the moment parallel to the c-axis. The value of Dy-moment equal to 5.5(2) μ_{B} are smaller than free Dy^{3+} ion value (10.0 μ_{B}). These and the three-step magnetization process indicate the strong influence of the crystal electric field on the stability of the magnetic order. Increase of the values of the lattice parameters at 1.5 K in reference of these at 20 K indicate magnetostriction effect at low temperatures.
11
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Electronic and Transport Properties of Ragsn (R=Ce,Pr,Nd,Dy) Compounds

88%
Fus D., Ivanov V., Jezierski A., Penc B., Szytuła A.
Acta Physica Polonica A
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2000
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vol. 98
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issue 5
571-586
EN
The electronic structure of the ternary RAgSn (R=Ce,Pr,Nd,Dy) compounds which crystallize in the hexagonal LiGaGe-type structure was studied by X-ray photoemission spectroscopy. Core-levels and valence bands were investigated. The X-ray photoemission spectroscopy valence bands are compared with the ones calculated using the spin-polarized tight-binding linear muffin-tin orbital method. The obtained results indicate that the valence bands are mainly determined by the Ag 4d band. The spin-orbit splitting values Δ_{SO} determined from the XPS spectra of 3d_{5/2} and 3d_{3/2} are equal to 18.8eV for R= Ce, 20.2eV for R = Pr and 22.6eV for R = Nd. The analysis of these spectra on the basis of the Gunnarsson-Schönhammer model gives a hybridization of f orbitals with the conduction band. The calculation of the total energy for two models of the crystal structure: an ordered of the LiGaGe-type and a disordered one of the CaIn_{2}-type indicate that in these compounds the LiGaGe-type structure is stable. Additionally, the temperature dependences of the electrical resistivity of CeAgSn and DyAgSn are investigated. At high temperatures the resistivity is not a linear function of temperature which indicates an electron-phonon interaction in the presence of a small s-d scattering, whereas at low temperatures anomalies connected with the magnetic phase transitions are observed.
12
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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.
13
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Magnetic Ordering in ErFe_{0.3}Ge_{2} and ErNi_{0.65}Ge_{2} Compounds

88%
Penc B., Arulraj A., Kaczorowski D., Szytuła A., Wawrzyńska E.
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issue 4
595-598
EN
The magnetic ordering in ErFe_{0.3}Ge_{2} and ErNi_{0.65}Ge_{2} compounds crystallizing in the orthorhombic structure of the CeNiSi_{2}-type has been investigated by neutron diffraction and magnetic measurements. The Er magnetic moments have been found to order antiferromagnetically below 2.5 K in ErFe_{0.3}Ge_{2} and 2.3 K in ErNi_{0.65}Ge_{2}. The magnetic structure of the former compound can be described by the propagation vector k = (0.044(1), 0, 0.384(1)). The Er magnetic moments are aligned along the a-axis and alternate with the sequence ++- in the unit cell. At 1.5 K they are equal to 5.9(1) μ_{B}. In contrast, the magnetic unit cell of ErNi_{0.65}Ge_{2} has been established to be equal to the chemical one. The magnetic moments in this compound are arranged in a collinear manner pointing along the a-axis with the sequence +-+-. The Er moment value measured at 1.5 K is 2.90(8) μ_{B}.
14
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Neutron Diffraction Studies of Nanoparticle DyMnO_3 Compound

88%
Szytuła A., Penc B., Dyakonov V., Baran S., Hoser A.
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vol. 125
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issue 1
65-66
EN
The neutron powder diffraction (NPD) measurements of the nano-size DyMnO_3 manganite have been performed. The obtained results indicate that this compound crystallizes in the orthorhombic crystal structure described by the space group Pnma. The Mn and Dy moments order antiferromagnetically at different temperatures and form modulated magnetic structure described by the propagation vector k=(k_x, 0, 0) with the different values of k_x component for the Mn and Dy sublattices. The values of k_x component for Mn sublattice increase with decreasing of the temperature and are smaller that in bulk compound. The wide Bragg peaks related to the Dy sublattice suggest that the magnetic order in this sublattice has the cluster-like character.
15
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Electronic Structure of TmPdIn

88%
Penc B., Kurleto R., Goraus J., Starowicz P., Szytuła A.
Acta Physica Polonica A
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2016
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vol. 129
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issue 6
1184-1186
EN
Electronic structure of a ternary TmPdIn compound, which crystallizes in the hexagonal ZrNiAl-type structure, was studied by X-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy. Density of states in the valence band was calculated by means of the augmented plane wave/local orbital method based on density functional theory. The results showed that the valence band is formed mainly of Tm 4f and Pd 4d states. In the ultraviolet photoemission spectra one can distinguish Pd 4d maximum and Tm 4f multiplet peaks, which are displaced with respect to those of pure Tm.
16
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Neutron Diffraction Studies of NdNi_5Sn Compound

88%
Penc B., Baran S., Hoser A., Romaka L., Szytuła A.
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vol. 126
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issue 3
772-774
EN
The neutron powder diffraction measurements of the NdNi_5Sn compound have been performed. The obtained results indicate that this compound crystallizes in a hexagonal CeNi_5Sn-type crystal structure described by the space group P6_3/mmc. The parameters of the crystal structure at 1.55 and 14.8 K are determined. In contradiction to the magnetic data the long-range magnetic ordering was not detected up to 1.55 K.
17
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Crystal Structure and Magnetic Properties of Tb_{11}O_{20}

88%
Baran S., Duraj R., Hoser A., Penc B., Szytuła A.
Acta Physica Polonica A
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2013
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vol. 123
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issue 1
98-100
EN
Magnetic and neutron diffraction data for Tb_{11}O_{20} compound are reported. This compound crystallizes in a triclinic crystal structure described by the space group P1 and is antiferromagnetic with the Néel temperature 5.1 K.
18
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Neutron Diffraction Studies of Tb_2Ni_{2-x}In Intermetallic Compounds

76%
Szytuła A., Baran S., Hoser A., Kalychak Y. M., Penc B., Tyvanchuk Y.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
994-997
EN
The magnetic ordering of the Tb_2Ni_{1.78}In and Tb_2Ni_2In have been studied by neutron diffraction measurements. Tb_2Ni_{1.78}In with the tetragonal Mo_2FeB_2-type (space group P4/mbm, tP10) is antiferromagnet with the Néel temperature equal to 20 K. Below this temperature Tb moments form collinear magnetic structure commensurate with the crystal, described by the propagation vectors equal to (1/4, 1/4, 1/2). Magnetic moment equal to 7.60(6) μ_{B} is parallel to c-axis. The Tb_2Ni_2In in the orthorhombic Mn_2 lB_2-type (space group Cmmm, oC10) was detected as an impurity in the studied sample. It orders antiferromagnetically below ≈ 100 K with collinear moment arrangement described by the propagation vector (1/2, 1/2, 1/2). t 1.6 K μ_{Tb} = 6.33(14) μ_{B} and is parallel to the c-axis.
19
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Magnetic Properties of Hexagonal RTIn Rare-Earth Intermetallics with Frustration

76%
Szytuła A., Baran S., Gondek Ł., Arulraj A., Penc B., Stüsser N.
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issue 4
590-594
EN
Magnetic properties, including magnetic structure, of some RTIn compounds (R = Tb-Er; T = Cu, Ni, Pd, Pt, Au) with the hexagonal ZrNiAl-type crystal structure are reported. Distribution of the rare earth atoms in the basal plane is similar to the kagomé-lattice. Magnetic moments are localized exclusively on the rare earth atoms and form different types of magnetic ordering. Experimental results are analyzed within the Ruderman-Kittel-Kasuya-Yosida and crystal electric field frames. Monte Carlo simulations, including the J_{1} and J_{2} exchange integrals between nearest and next nearest spins and Dzialoshinsky-Moriya interaction, were performed resulting in a number of magnetic phases, some of which are in good agreement with the magnetic ordering determined in the neutron diffraction experiments.
20
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Photoemission Electronic States of (Mn_{1-x}Fe_x)_5Si_3

76%
Penc B., Zalecki R., Jezierski A., Szytuła A., Kołodziejczyk A., Ivanov V.
Acta Physica Polonica A
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2005
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vol. 107
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issue 6
967-976
EN
The core-level and valence band electronic states studies of single crystalline transition metal silicides (Mn_{1-x}Fe_x)_5Si_3 (x=0 and 0.05) by the X-ray and ultraviolet photoemission spectroscopies are reported. The Mn 2p core-level spectra for both compounds were ascribed to the relevant Mn sites in their crystal structure. The valence band spectra were compared with the result of ab-initio band calculations using the tight-binding linear muffin-tin orbital method. It was concluded that the enhancement of the spectral density within the 2 eV binding energy region below the Fermi energy comes from the effect of strongly correlated Mn 3d electrons.
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