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Wyświetlanie 1-15 z 27
Tytuł:
Magnetic Properties of $Ho_{5}Ni_{2}In_{4}$
Autorzy:
Tyvanchuk, Yu.
Penc, B.
Szytuła, A.
Zarzycki, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538371.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.30.Kz
Opis:
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.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 599-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evidence of the non-magnetic ordering in TmRu₂Si₂ at low temperatures
Autorzy:
Szytuła, A.
Hoser, A.
Baran, S.
Penc, B.
Powiązania:
https://bibliotekanauki.pl/articles/1058840.pdf
Data publikacji:
2016-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.F-
75.20.En
Opis:
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.
Źródło:
Acta Physica Polonica A; 2016, 130, 6; 1371-1372
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Behaviour and Electronic Structure of the R$\text{}_{2}$PdSi$\text{}_{3}$ (R = Ce, Nd, Tb-Er) Compounds
Autorzy:
Szytuła, A.
Hofmann, M.
Penc, B.
Ślaski, M.
Majumdar, Subham
Sampathkumaran, E. V.
Zygmunt, A.
Powiązania:
https://bibliotekanauki.pl/articles/2013678.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
75.30.Cr
75.30.Kz
79.60.-i
Opis:
The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples of R$\text{}_{2}$ PdSi$\text{}_{3}$ (R = Ce, Nd, Tb-Er). In Ce$\text{}_{2}$PdSi$\text{}_{3}$ the Ce moments order below 2.5 K. The Nd magnetic moments in Nd$\text{}_{2}$PdSi$\text{}_{3}$ exhibit ferromagnetic ordering below 17 K. In Tb$\text{}_{2}$PdSi$\text{}_{3}$, a complex situation is observed: in the temperature range from 1.5 K to (T$\text{}_{N}$=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$\text{}_{N}$ (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.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 823-826
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties and Electronic Structure of CeTIn (T = Ni, Cu, Pd, Au) Compounds
Autorzy:
Szytuła, A.
Penc, B.
Gondek, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/2047306.pdf
Data publikacji:
2007-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.27.+a
75.20.Hr
79.60.-i
Opis:
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$\text{}^{1}$ 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.
Źródło:
Acta Physica Polonica A; 2007, 111, 4; 475-486
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Hexagonal RTIn Rare-Earth Intermetallics with Frustration
Autorzy:
Szytuła, A.
Baran, S.
Gondek, Ł.
Arulraj, A.
Penc, B.
Stüsser, N.
Powiązania:
https://bibliotekanauki.pl/articles/1538314.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
75.30.Kz
Opis:
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.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 590-594
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Structure of RCuIn (R = Nd, Tb, Ho, Er)
Autorzy:
Szytuła, A.
Baran, S.
Jaworska-Gołąb, T.
Penc, B.
Zarzycki, A.
Stűsser, N.
Arulraj, A.
Tyvanchuk, Yu.
Powiązania:
https://bibliotekanauki.pl/articles/1813175.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.12.-q
71.20.Lp
75.25.+z
75.50.Ee
Opis:
Magnetic and neutron diffraction measurements of RCuIn (R = Nd, Tb, Ho, Er) are reported. The compounds crystallize in the hexagonal ZrNiAl-type structure. The ZrNiAl lattice originates from a distortion of a kagomélattice. The studied compounds are antiferromagnets with the Néel temperature equal to 4.9 K for R = Nd, 14.5 K for R = Tb, 4.5 K for R = Ho and 3.5 K for R = Er. The magnetic ordering is described by the propagation vectorwe k = (1/2, 1/2, $k_z$) with $k_z$ equal to 0.161(6) for R = Nd, 0.2213(5) for R = Tb, 0.2510(3) for R = Ho and 0 for R = Er. The magnetic structure is noncollinear with magnetic moments in the basal plane for R = Nd, Tb and Ho and collinear with magnetic moments parallel to the c-axis for R = Er. The observed magnetic ordering results from the competition between exchange interactions of the Ruderman-Kittel-Kasuya-Yosida type, the geometrical frustration of the rare-earth magnetic moments and the influence of the crystal electric field. The latter affects the direction of magnetic moments and is responsible for the magnetic crystalline anisotropy.
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1185-1192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Structures of Ho_5Rh_4Ge_{10}
Autorzy:
Szytuła, A.
Penc, B.
Hofmann, M.
Sikora, W.
Powiązania:
https://bibliotekanauki.pl/articles/1399030.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.-j
75.47.Pq
75.50.Ee
Opis:
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.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 1002-1004
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixed-Valence State in $Yb_2CuGe_6$
Autorzy:
Szytuła, A.
Penc, B.
Konyk, M.
Winiarski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813177.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
75.20.Hr
79.60.-i
Opis:
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.
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1205-1209
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutron Diffraction Studies of Nanoparticle $DyMnO_3$ Compound
Autorzy:
Szytuła, A.
Penc, B.
Dyakonov, V.
Baran, S.
Hoser, A.
Powiązania:
https://bibliotekanauki.pl/articles/1206328.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.F-
75.25.-j
75.50.Ee
Opis:
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.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 65-66
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutron Diffraction Studies of Tb_2Ni_{2-x}In Intermetallic Compounds
Autorzy:
Szytuła, A.
Baran, S.
Hoser, A.
Kalychak, Ya.M.
Penc, B.
Tyvanchuk, Yu.
Powiązania:
https://bibliotekanauki.pl/articles/1399026.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.-j
75.47.Np
75.50.Ee
Opis:
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.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 994-997
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Frustration in Some Magnetic Compounds
Autorzy:
Szytuła, A.
Gondek, Ł.
Penc, B.
Hernandez-Velasco, J.
Powiązania:
https://bibliotekanauki.pl/articles/2038386.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Nr
75.25.+z
75.50.Ee
Opis:
In the paper the results of the powder neutron diffraction measurements of RAuIn (R = Ce, Tb, Dy, and Er) and ZnFe$\text{}_{2}$O$\text{}_{4}$ 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$\text{}_{2}$O$\text{}_{4}$ has the normal spinel structure in which the Fe$\text{}^{3+}$ 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.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 583-591
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valence Band of $Ce_2Co_{0.8}Si_{3.2}$ and $Ce_2RhSi_3$ Studied by Resonant Photoemission Spectroscopy and FPLO Calculations
Autorzy:
Starowicz, P.
Kurleto, R.
Goraus, J.
Walczak, Ł.
Penc, B.
Adell, J.
Szlawska, M.
Kaczorowski, D.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1374249.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
75.30.Mb
71.20.Eh
74.25.Jb
Opis:
This work presents studies of the valence band of two Kondo lattice systems: $Ce_2Co_{0.8}Si_{3.2}$, which is paramagnetic with the Kondo temperature $T_{K}$ ≈50 K and $Ce_2RhSi_3$, which is antiferromagnetic below $T_{N}$=4.5 K and exhibits $T_{K}$ ≈9 K. The photoemission spectra, which are obtained with photon energy tuned to Ce 4d-4f resonance, reveal a Kondo peak at the Fermi energy $(E_{F})$, its spin-orbit splitting partner at 0.24 eV and a broad maximum related to Ce $f^0$ final state. The spectra indicate that Kondo peak has a higher intensity for $Ce_2Co_{0.8}Si_{3.2}$. The off-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards $E_{F}$ for $Ce_2Co_{0.8}Si_{3.2}$ as compared to $Ce_2RhSi_3$. Full-potential local-orbital calculations were realized with local spin density approach +U approach for 213 stoichiometry. They show that a higher density of states near $E_{F}$ is observed for $Ce_2CoSi_3$. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of $Ce_2RhSi_3$ and $Ce_2CoSi_3$, respectively.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-144-A-147
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic structure of TmPdIn
Autorzy:
Penc, B.
Kurleto, R.
Goraus, J.
Starowicz, P.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1065057.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.15.Mb
79.60.Bm
Opis:
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.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1184-1186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Ordering in $ErFe_{0.3}Ge_{2}$ and $ErNi_{0.65}Ge_{2}$ Compounds
Autorzy:
Penc, B.
Arulraj, A.
Kaczorowski, D.
Szytuła, A.
Wawrzyńska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1538339.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
75.50.Ee
Opis:
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) $μ_{B}$.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 595-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutron Diffraction Studies of $NdNi_5Sn$ Compound
Autorzy:
Penc, B.
Baran, S.
Hoser, A.
Romaka, L.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1205240.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.F-
75.20.En
Opis:
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.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 772-773
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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