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    Wyświetlanie 1-5 z 5
    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:
    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:
    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:
    Influence of the Grain Size on the Magnetic Properties of $TbMnO_{3}$
    Autorzy:
    Bażela, W.
    Dul, M.
    Dyakonov, V.
    Gondek, Ł.
    Hoser, A.
    Hoffmann, J.
    Penc, B.
    Szytuła, A.
    Kravchenko, Z.
    Nosalev, I.
    Zarzycki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431251.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.Cp
    61.05.F-
    61.05.J-
    75.30.kz
    75.50.Ee
    75.50.-y
    Opis:
    The magnetic properties including magnetic structure of poly and nano samples of $TbMnO_{3}$ are determined. All the samples investigated are antiferromagnets. In these samples the Mn ad Tb moments order antiferromagnetically at different temperatures and form modulated magnetic structure described by the propagation vector k=($k_{x}$,0,0) with different value of $k_{x}$ for the Mn and Tb sublattices. Comparison of the data for poly and nano samples indicates the decrease of the moment and increase of the $k_{x}$ component of propagation vector in the nano specimens. The wide Bragg peak related to the Tb sublattice suggests that the magnetic order has the claster-like character. The magnetic moments value in both sublattices is smaller, whereas the $k_{x}$ values are larger for nano samples.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 785-788
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Neutron Diffraction Studies of the Polycrystalline and Nanoparticle $TbMnO_3$
    Autorzy:
    Bażela, W.
    Dul, M.
    Dyakonov, V.
    Gondek, Ł.
    Hoser, A.
    Hoffmann, J.
    Penc, B.
    Szytuła, A.
    Kravchenko, Z.
    Nosalev, I.
    Zarzycki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419577.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.47.Lx
    75.25.-j
    75.50.Ee
    Opis:
    This paper reports on investigations of magnetic properties, crystal and magnetic structures on $TbMnO_3$ prepared in various ways, namely, as conventional polycrystalline sample and two nano particle specimens (synthesized with a sol-gel method at temperatures of 800 and 850°C). The X-ray and neutron diffraction data confirm the orthorhombic crystal structure (space group Pbnm, No. 62) without noticeable differences of the lattice parameters for poly- and nanocompounds. For the polycrystalline sample, a subsequent ordering of the Mn and Tb sublattices with decreasing temperature was observed. Namely, the Mn sublattice exhibits a modulated magnetic structure with the propagation vector k = (0, $k_{x},$ 0) in between 41-5 K. Below T = 21 K, a change from a collinear ($A_{y}$ mode) into non-collinear ($A_{y}G_{z}$ mode) structure was evidenced. Further decreasing of temperature below 10 K results in magnetic ordering of the Tb sublattice (modulated $G_{x}A_{y}F_{z}$ mode). For nanoparticle compounds, magnetic ordering in the Mn and Tb sublattices is described by propagation vector k = (0, $k_{y},$ 0), with $k_{y}$ components higher than observed for polycrystalline sample. The magnetic ordering in the Mn sublattice is described by a collinear $A_{y}$ mode down to 1.6 K where the Tb moment becomes ordered ($G_{x}A_{y}$ mode). The observed broadening of the Bragg peaks connected to the Tb sublattice suggests the cluster-like character of its magnetic structure.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 384-390
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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