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    Wyświetlanie 1-6 z 6
    Tytuł:
    Magnetic Properties of RCuGe (R=Pr, Nd, Gd, Tb, Dy, Ho, Er) Compounds
    Autorzy:
    Baran, S.
    Leciejewicz, J.
    Stüsser, N.
    Szytuła, A.
    Tomkowicz, Z.
    Zygmunt, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964562.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.30.Kz
    75.50.Ee
    Opis:
    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$\text{}_{N}$ 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$\text{}_{N}$ 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.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 271-275
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Chemical Disorder on Geometrically Frustrated Kagome Lattice
    Autorzy:
    Szymczak, H.
    Szymczak, R.
    Baran, M.
    Fink-Finowicki, J.
    Krzymanska, B.
    Aleshkevych, P.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812268.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.30.Gw
    75.30.Kz
    75.50.-
    Opis:
    This paper reviews recent progress in the studies of magnetic dilutions on magnetic properties of two frustrated systems: magnetoplumbite-like $SrGa_{12-x}Cr_xO_{19}$ and kagome staircase $Co_3V_2O_8$ doped with Mg ions. In the first group of compounds magnetic properties are determined by magnetic defects arising due to doping. In the case of kagome staircase compounds magnetic dilution suppresses effects of crystal field acting on magnetic ions. In particular, the dilution decreases magnetocrystalline anisotropy and anisotropy of magnetization.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 35-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $Dy_{11}Si_4In_6$
    Autorzy:
    Duraj, D.
    Baran, S.
    Jaworska-Gołąb, T.
    Kalychak, Ya.
    Przewoźnik, J.
    Szytuła, A.
    Tyvanchuk, Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427191.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.40.-s
    75.40.Gb
    65.40.gd
    Opis:
    Magnetic and specific heat measurements of $Dy_{11}Si_4In_6$ are reported. This compound crystallizes in the tetragonal $Sm_{11}Ge_4In_6$-type crystal structure (space group I4/mmm), in which Dy atoms occupy four different sites. The AC and DC magnetic measurements suggest complex magnetic properties. Below $T_{c}$ = 52 K magnetic ordering has a ferromagnetic component, while below 20 K a change of the properties is observed. Near the Curie temperature the magnetocaloric effect with the magnetic entropy change $\Delta S_{m}$ equal to 16.5 J/(kg K) is observed. The specific heat data indicate only the phase transition at 52 K.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1118-1120
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heavy Ion Irradiation on the Magnetic Properties of CuGeO$\text{}_{3}$
    Autorzy:
    Gładczuk, L.
    Mosiniewicz-Szablewska, E.
    Szymczak, R.
    Baran, M.
    Dąbkowska, H. A.
    Choiński, J.
    Czosnyka, T.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013715.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.50.Ee
    76.30.Da
    Opis:
    The influence of heavy ion irradiation on the magnetic properties of the spin-Peierls compound CuGeO$\text{}_{3}$ has been investigated by means of the electron paramagnetic resonance, the spontaneous magnetization, and the low field ac susceptibility. The measurements were performed on the CuGeO$\text{}_{3}$ single crystals before and after irradiation with 80 MeV oxygen ions in the wide temperature range of 2-300 K. It was found that the irradiation induced an increase in the EPR signal intensity, magnetization, and susceptibility of this material. It was also shown that the irradiation does not lead to a decrease in the spin-Peierls transition temperature and to the formation of an antiferromagnetic phase which is expected to appear in disordered spin-Peierls systems.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 871-874
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mesoscopic Ordering Effects in Single-Crystalline Thin Films of Lanthanum Manganites
    Autorzy:
    Samoilenko, Z. A.
    Okunev, V. D.
    Pushenko, E. I.
    Abal'oshev, A.
    Baran, M.
    Gierłowski, P.
    Lewandowski, S. J.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037100.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.47.Lx
    61.50.Ks
    Opis:
    We have investigated thin films of lanthanum manganites epitaxially grown by pulsed laser deposition on single-crystalline substrates. X-ray diffraction studies show that the characteristic feature of the investigated films is a superposition of fractions with long range atomic order in the basic single-crystalline matrix, and mesoscopic order in the clusterized structure encompassing the Mn-O layers. A detailed analysis of diffusive scattering shows that the size of metallic clusters and their volume concentration in the dielectric matrix varies. In the case of a small size and concentration, the metallic clusters in low temperature behave as quantum dots and their presence leads to a tunneling mechanism of conductivity with characteristic R(T)= const. In the case of large cluster size, the discrete energy levels become smeared. It appears also that the optical, transport, and magnetic properties of the investigated films depend critically on the distribution of Mn$\text{}^{2+}$, Mn$\text{}^{3+}$, and Mn$\text{}^{4+}$ ions in the clusters.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 93-98
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic Order and the Interaction of Electronic and Magnetic Subsystems in Epitaxial LaSr(Ca)MnO Films
    Autorzy:
    Okunev, V. D.
    Samoilenko, Z. A.
    D'yachenko, T.
    Abal'oshev, A.
    Baran, M.
    Gierłowski, P.
    Lewandowski, S. J.
    Szewczyk, A.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037110.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.47.Lx
    61.50.Ks
    Opis:
    We have investigated the structure, and electric, optical, and magnetic properties of LaSr(Ca)MnO films containing atomic clusters of various types coherently built into the basic crystallographic matrix. Below the transition to the metallic state, the electrical conductivity of the films is determined by tunneling of charge carriers between metallic clusters. We have found that for each sample there exists a threshold value of magnetic ordering, above which the magnetic subsystem starts to affect actively the film conductivity. The observed increase of conductivity with decreasing temperature is caused by the fact that in the process of magnetic ordering of the samples the cluster size and concentration of metallic phase increase. Experimental results are in agreement with theoretical calculations.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 121-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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