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Wyszukujesz frazę "Medvedev, Yu." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Tunneling Conductivity of Manganites with Negative Magnetoresistance
    Autorzy:
    Medvedev, Yu. V.
    Tarenkov, V. Yu.
    Svistunov, V. M.
    Abaloshev, A. V.
    Abalosheva, I. S.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013683.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Pa
    Opis:
    Tunneling investigations of ferromagnetic La$\text{}_{0.6}$Sr$\text{}_{0.4}$MnO$\text{}_{3}$ ceramic samples showing negative magnetoresistance effect were carried out in two types of junctions: symmetric "break junctions" and asymmetric ceramics-insulator-metal junctions. The results are consistent with the presence of small ferromagnetic clusters in the insulating barriers of both types of junctions and suggest a two-phase state realized by impurity mechanism of phase separation.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 827-830
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Negative Magnetoresistance of Layered High-t$\text{}_{c}$ Compounds
    Autorzy:
    Medvedev, Yu. V.
    Yampolskii, S. V.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011093.pdf
    Data publikacji:
    1999-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.Jt
    74.80.Dm
    Opis:
    Magnetoresistance of layered high-T$\text{}_{c}$ systems with quasi-two-dimensional superconductivity in magnetic field H applied parallel to superconducting planes was investigated theoretically. In such configuration an increase in the magnetic field intensity decreases the critical temperature of superconducting regions. It causes both a suppression of the gap parameter Δ and an increase in the tunneling current between the decoupled superconducting planes and, as a consequence, leads to negative magnetoresistance. The dependence of tunneling current on H was calculated for superconducting layer thickness d$\text{}_{S}$ smaller than the superconducting correlation length. The results can be used for analysis of current-voltage characteristics of both superconductor-insulator-superconductor and superconductor-insulator normal metal multilayered tunnel structures.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 3-4; 501-504
    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
    Tytuł:
    Inelastic Relaxation of Oxygen and Low-Field Magnetoresistance in La$\text{}_{0.65}$Ca$\text{}_{0.35}$MnO$\text{}_{3}$ Films on Ferroelectric Ceramics Substrates
    Autorzy:
    Medvedev, Yu. V.
    Mezin, N. I.
    Nikolaenko, Yu. M.
    Pigur, A. E.
    Shishkova, N. V.
    Ishchuk, V. M.
    Chukanova, I. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041603.pdf
    Data publikacji:
    2004-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.Dy
    Opis:
    Galvanomagnetic properties of polycrystalline La$\text{}_{0.65}$Ca$\text{}_{0.35}$MnO$\text{}_{3}$ films with a thickness of 0.2~μm deposited onto Pb$\text{}_{2.9}$Ba$\text{}_{0.05}$Sr$\text{}_{0.05}$(Zr$\text{}_{0.4}$Ti$\text{}_{0.6}$)O$\text{}_{3}$ ferroelectric ceramics substrates were investigated. We discovered an irreversible increase in film resistance after numerous inversions of substrate polarization. This phenomenon was investigated several times for three film structures. The typical duration of the process of a monotonic 3-5 times increase in film resistance was 3-6 hours. The long-time relaxation of macroscopic film resistance is explained by dielectrization of film intercrystallite boundaries. The typical size of crystallites of both the film and the substrate is 3-10μm. Such small size explains the fact of macroscopic homogeneity of film conductivity, when the specific resistance increases from 1.8×10$\text{}^{-2}$ to 1.8Ω cm. A growth in resistance of narrow (10 nm) regions of film is explained by the redistribution of oxygen anions under the action of inhomogeneous mechanical stress. The stress between crystallites appears due to inverse piezoelectric effect of ferroelectric substrate. The magnitude of diffusion coefficient of oxygen is estimated to be D≥10$\text{}^{-20}$ m$\text{}^{2}$ s$\text{}^{-1}$.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 6; 853-859
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast Bolometric Response of Bulk La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ Electroceramic Structures
    Autorzy:
    Nikolaenko, Yu. M.
    Maksimov, I. S.
    Medvedev, Yu. V.
    Ulyanov, A. N.
    Grishin, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014001.pdf
    Data publikacji:
    2000-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Kp
    85.60.Gz
    72.15.Gd
    Opis:
    We report on the performance of a microwave electroceramic bolometer of hybrid La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$/Al$\text{}_{2}$O$\text{}_{3}$ (0.2×2×4 mm$\text{}^{3}$) structure. The estimated thermal resistance of the bulk ceramic manganite film-single crystal sapphire interface is about 500 K/W at room temperature. This resistance is the main thermal barrier in the heat sink system and has been found to be slightly dependent on temperature. When compared with the high-T$\text{}_{c}$ superconducting bolometers, the La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ microwave electroceramic bolometer works in a more wide temperature range, from 77 K to 330 K, excluding the narrow temperature interval at the metal-insulator phase transition (T=230 K). The microwave electroceramic bolometer sensitivity and the time constant at room temperature have been found to be 0.1 V/W and 100 ms, respectively. To improve the bolometer performance the point contact has been fabricated by a break junction technique. The optimization of a microwave electroceramic bolometer design brought to a considerable improvement of basic bolometer characteristics. The microwave sensitivity was about 0.3 V/W and the time constant was less than 100 ns.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 6; 991-995
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Transport and Magnetic Properties of La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ Thin Films
    Autorzy:
    Baran, M.
    Berkowski, M.
    Fink-Finowicki, J.
    Lewandowski, S. J.
    Szymczak, H.
    Szymczak, R.
    Khartchev, S. I.
    Medvedev, Yu. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037109.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    72.15.Gd
    75.70.Pa
    Opis:
    The magnetic and transport properties of epitaxial La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ CuO$\text{}_{3}$ thin films deposited on SrLaGaO$\text{}_{4}$ substrate using dc magnetron sputtering technique are reported. The giant magnetoresistance effect (of about 50% at magnetic field of 1 T) was observed near the Curie temperature. Several mechanisms responsible for temperature dependence of resistivity are discussed. The effect of annealing was studied. It shifted the Curie temperature to the lower value, probably, because of the loss of oxygen.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 115-120
    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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