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    Wyświetlanie 1-7 z 7
    Tytuł:
    Giant Magnetocaloric Effect in Manganites
    Autorzy:
    Szymczak, R.
    Kolano, R.
    Kolano-Burian, A.
    Dyakonov, V.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550566.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.30.Sg
    75.40.Cx
    Opis:
    In this review we briefly discuss the magnetocaloric properties of the manganites. It is evidenced that the maximum entropy change observed in manganites exceeds that of gadolinium (the prototype material for room temperature refrigerators). For the manganites characterized by second-order magnetic phase transitions the scaling hypothesis is discussed. It is shown that simple phenomenological model with only one fitting parameter, presented in this paper, satisfactorily describes experimental observations.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 203-206
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Orbital Correlations and Magnetic Phase Transitions in Lightly Doped La$\text{}_{0.88}$MnO$\text{}_{x}$ and LaMn$\text{}_{0.94}$O$\text{}_{y}$ Manganites
    Autorzy:
    Troyanchuk, I. O.
    Khomchenko, V. A.
    Tovar, M.
    Szymczak, H.
    Bärner, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037044.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.47.Lx
    61.50.Ks
    Opis:
    The results of X-ray and neutron diffraction study as well as the elastic, magnetic, and electrotransport properties of La$\text{}_{0.88}$MnO$\text{}_{x}$ (2.82≤ x≤2.96) and LaMn$\text{}_{0.94}$O$\text{}_{y}$ (2.91≤ y≤3.00)$ manganites have been presented. Under oxygen doping, the transitions from antiferromagnetic to ferromagnetic or spin-glass state are observed for La-deficient and La-excessive series, respectively. These transitions have been found to correlate with the change of the type of Jahn-Teller distortions from static to dynamic ones. The dynamic orbital correlations favor a ferromagnetic state, while an A-type antiferromagnetic state is typical of the static Jahn-Teller distortions. It is argued that the canting magnetic structure in manganites is not realized. The transition to a ferromagnetic or spin-glass state occurs via the formation of inhomogeneous state with different types of orbital correlations and magnetic structure. The key role of intrinsic chemical inhomogeneity in the formation of inhomogeneous magnetic states in solid solutions of manganites is emphasized.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 27-44
    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
    Tytuł:
    Magnetic Properties of the Nanocrystalline $DyMnO_{3}$ Compound
    Autorzy:
    Dyakonov, V.
    Szytuła, A.
    Baran, S.
    Kravchenko, Z.
    Zubov, E.
    Iessenchuk, O.
    Bazela, W.
    Dul, M.
    Zarzycki, A.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538453.pdf
    Data publikacji:
    2010-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.47.Lx
    75.50.Ee
    75.75.-c
    Opis:
    We report on the X-ray powder diffraction and magnetic measurements of the polycrystalline and the two nanocrystalline samples of $DyMnO_{3}$ compound synthesized at temperatures of 800 and 850°C. All samples at room temperature crystallize in the orthorhombic crystal structure (space group Pnma). The crystal structure parameters determined change only slightly with preparation methods but the average grains size of the nanoparticles determined from X-ray data increases significantly with increasing annealing temperature. Temperature dependence of the magnetic susceptibility indicates the antiferromagnetic order in Dy sublattice at low temperatures.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 4; 607-610
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barrier and Self-Energy Effects in Manganite Tunneling Characteristics
    Autorzy:
    Svistunov, V.
    Revenko, Y.
    Belogolovskii, M.
    Gerasimenko, A.
    Pashkevich, Y.
    Szymczak, H.
    Przyslupski, P.
    Komissarov, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037099.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    75.47.Lx
    Opis:
    Tunneling conductance spectra of point-contact junctions formed by a sharp Ag tip and two optimally doped manganites La$\text{}_{0.67}$Sr$\text{}_{0.33}$MnO$\text{}_{3}$ and Nd$\text{}_{0.67}$ Sr$\text{}_{0.33}$MnO$\text{}_{3}$ are measured and analyzed. It was found that the analytical dependence of the differential conductance on voltage strongly depends on the bias sign and dramatically changes after voltage treatments. The data obtained are explained in terms of the Glasman-Matveev model for tunneling across two localized states settled in the barrier near the manganite bulk. Effective functions of electron-boson interaction extracted from self-energy contributions to the experimental characteristics contain signs of phonon and magnon excitations, higher-energy satellites as a result of possible orbital ordering and a hallmark of localized states in the near-barrier region in the form of strong not-well reproduced peaks.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 87-92
    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:
    Magnetic and Ferroelectric Ordering in the $TbMnO_3$ Film
    Autorzy:
    Sazanovich, A.
    Nikolaenko, Yu.
    Paszkowicz, W.
    Mikhaylov, V.
    Dyakonov, K.
    Medvedev, Yu.
    Nizhankovskii, V.
    Dyakonov, V.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207010.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.85.+t
    75.70.Ak
    77.55.Nv
    Opis:
    Measurements of magnetization and electric polarization performed for the $TbMnO_3$ film grown onto the single crystal [100] $SrTiO_3$ substrate using magnetron sputtering technique exhibit series of anomalies related to the magnetic and electric ordering of the $Tb^{3+}$ and $Mn^{3+}$ sublattices. The detailed temperature dependences of the electric polarization and dielectric constant of the $TbMnO_3$ film have shown that the ferroelectric phase appears below 30 K in magnetic field H > 1 T applied in-plane and out-of-plane of the film.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 128-130
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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