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    Wyświetlanie 1-8 z 8
    Tytuł:
    Superconductivity in $Lu_xZr_{1-x}B_{12}$ Dodecaborides with Cage-Glass Crystal Structure
    Autorzy:
    Sluchanko, N.
    Azarevich, A.
    Bogach, A.
    Gavrilkin, S.
    Glushkov, V.
    Demishev, S.
    Mitsen, K.
    Shitsevalova, N.
    Filippov, V.
    Gabani, S.
    Flachbart, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398292.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.-q
    74.62.Bf
    74.70.Ad
    Opis:
    We probed the evolution of the superconducting transition temperature $T_c$ and the normal state parameters of $Lu_xZr_{1-x}B_{12}$ solid solutions employing resistivity, heat capacity and magnetization measurements. In these studies of high-quality single crystals it was found that there are two types of samples with different magnetic characteristics. An unusually strong suppression of superconductivity in $Lu_xZr_{1-x}B_{12}$ with a rate $dT_c/dx=0.21 K/at.%$ of Lu was observed previously on the first "magnetic" set of crystals, and it was argued to be caused by the emergence of static spin polarization in the vicinity of non-magnetic lutetium ions. On the contrary, the second (current) set of "nonmagnetic" crystals demonstrates a conventional $T_c(x)$ dependence with a rate $dT_c/dx=0.12 K/at.%$ of Lu which is typical for BCS-type superconductors doped by nonmagnetic impurities. The reason for this difference is yet unclear. Moreover, the H-T phase diagram of the superconducting state of $Lu_xZr_{1-x}B_{12}$ (0 ≤ x ≤ 1) solid solutions has been deduced from magnetization measurements.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1036-1038
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reentrant Metal-Insulator Transition in $Ca_{1-x}Eu_{x}B_{6}$
    Autorzy:
    Glushkov, V.
    Anisimov, M.
    Baybakov, R.
    Demishev, S.
    Filippov, V.
    Flachbart, K.
    Kuznetsov, A.
    Shitsevalova, N.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1369362.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    72.15.Gd
    75.47.Gk
    Opis:
    Resistivity, Hall and Seebeck effects have been studied on single crystals of $Ca_{1-x}Eu_{x}B_{6}$ (0 ≤ x ≤ 1) at temperatures 2-300 K and in magnetic fields up to 8 T. An insulating ground state is found to be limited by narrow range of Eu doping 0.6 ≤ x ≤ 0.8. This region is characterized by an enhanced colossal magnetoresistance (CMR), which reaches values of ρ(0)/ρ(7T) > $10^{6}$ for x = 0.63 at T < 10 K. Decreasing of Eu content in $Ca_{1-x}Eu_{x}B_{6}$ below x* ≈ 0.6 restores the metallic ground state with moderate resistivity (ρ ~ 1 ÷ 5 mΩ·cm) and CMR amplitude (ρ(0)/ρ(7T) < 7). The second metal-insulator transition (MIT) in $Ca_{1-x}Eu_{x}B_{6}$ is observed beyond the whole conductivity region found earlier in the narrow range of Eu doping (0.7 ≤ x ≤ 0.8). The correlation between the enhanced CMR amplitude, the onset of positive diffusive thermopower and the elevation of anomalous Hall effect, determined for Eu content 0.6 ≤ x ≤ 0.85, favors the idea that a smooth change of band structure is the main factor governing the reentrant MIT in $Ca_{1-x}Eu_{x}B_{6}$.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 294-295
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of interaction of plasma jets generated in a plasma focus facility with an ambient plasma in external magnetic field
    Autorzy:
    Filippov, N.
    Filippova, T.
    Filippov, A.
    Friart, D.
    Karakin, M.
    Khautiev, E.
    Krauz, V.
    Mokeev, A.
    Myalton, V.
    Nikulin, S.
    Simonet, F.
    Tykshaev, V. P.
    Vierne, J.
    Vinogradov, V. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147551.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    collisionless shocks
    plasma focus
    plasma jets
    Opis:
    The aim of the present experiments was to reproduce and to study in laboratory quasi-perpendicular supercritical collisionless shocks similar to the Earth-Solar Wind shock, by using a plasma focus facility as the plasma source. The experiments were performed on the PF-3 facility (Filippov-type plasma focus) at a level of energy supply of about 1 MJ. Directed plasma jets are produced with axial velocities ~107 cm/s after compression of a plasma-current sheath in the initial stage of plasma focus formation. These jets then travel through an ambient plasma resulting in early gas ionization by X-ray radiation from the plasma focus, and at an angle of 90° to the 2500 G external magnetic field applied by a system based on rear-earth magnets. Our experimental conditions allowed us to reach a range MA ~ 5÷10.
    Źródło:
    Nukleonika; 2001, 46, 1; 31-34
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A rapid method for evaluation of partial potato resistance to late blight and of aggressiveness of Phytophthora infestans isolates originating from different regions
    Autorzy:
    Filippov, Alexey V.
    Gurevich, Boris I.
    Kozlovsky, Boris E.
    Kuznetsova, Maria A.
    Rogozhin, Alexandr N.
    Spiglazova, Svetlana Y.
    Smetanina, Tatiana I.
    Smirnov, Alexey N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198972.pdf
    Data publikacji:
    2004-12-20
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    aggressiveness
    late blight
    mathematical model
    potato cultivars
    resistance
    yield losses
    Opis:
    The procedure of evaluation is based on mathematical simulation model of the late blight (LB) development in combination with laboratory testing of detached leaflets artificially inoculated with Phytophthora infestans. An incubation period, amount and sizes of lesions and sporulation capacity are estimated. Each couple “tested Phytophthora isolate and tested potato cultivar” is compared with a standard couple “Phytophthora isolate N161 and standard cultivar”. A simulator on the base of these data calculates area under the curve for LB development and yield loss due to LB for a situation when a yield loss of a standard cultivar infected with a standard isolate is equal 35%. Comparison of a new rapid laboratory method and field methods showed satisfactory correlation. Resistance to late blight was evaluated for 47 potato cultivars with the new method. It was also shown that some variations in foliar aggressiveness existed among P. infestans populations from different regions. Supported by ISTC grant #1640.
    Źródło:
    Plant Breeding and Seed Science; 2004, 50; 29-41
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect Mode in $LaB_{6}$
    Autorzy:
    Anisimov, M.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Samarin, N.
    Gavrilkin, S.
    Mitsen, K.
    Shitsevalova, N.
    Levchenko, A.
    Filippov, V.
    Gabani, S.
    Flachbart, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371551.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.Ba
    Opis:
    The specific heat of high quality $La^{N}B_{6}$ (N=10, 11, natural) single crystals is investigated in a wide range of temperatures 2 - 300 K. The obtained data allow to estimate correctly (i) the electronic γ· T term of specific heat (γ ≈ 2.4 mJ/(mol·$K^{2}$)), (ii) the contribution from quasilocal vibrating mode of $La^{3+}$ ions ($Θ_{E}$ ≈ 150 - 152 K), (iii) the Debye-type term from rigid boron cages ($Θ_{D}$ ≈ 1160± 40 K). Our data also suggest an additional defect-mode component (iv) which may be attributed to a contribution of 1.5% boron vacancies in $LaB_{6}$. The obtained results may be interpreted in terms of formation of two level systems, which appear when $La^{3+}$ ions are displaced from their centrosymmetric positions in the cavities of rigid boron cages, apart from randomly distributed boron vacancies in the $LaB_{6}$ matrix.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 350-351
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hall Effect in $GdB_{6}$
    Autorzy:
    Anisimov, M.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Samarin, N.
    Shitsevalova, N.
    Levchenko, A.
    Filippov, V.
    Kuznetsov, A.
    Flachbart, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371548.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    Opis:
    The Hall effect of $GdB_{6}$ has been studied on high quality single crystals in the temperature range 2-150 K and in magnetic field of 1 T. The obtained data allow to detect anomalies in the antiferromagnetic (AF) phase including (i) a drastic enhancement of negative Hall coefficient below $T_{N1}$ ≈ 15.5 K and (ii) the appearance of an anomalous Hall effect at $T_{N2}$ ≈ 4.7 K. Possible scenarios of the AF ground state formation are discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 348-349
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distinguishing Features of Phase Transformation in the Surface Layer of Hardened Steel with (α+γ)-Two-Phase Structure during Plasto-Elastic Loading at Different Rates
    Autorzy:
    Alekseeva, L. E.
    Sinelnikov, V. A.
    Filippov, G. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945237.pdf
    Data publikacji:
    1996-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    Opis:
    An effect of loading during uniaxial tension at different rates ranging from 10$\text{}^{-4}$ to 10$\text{}^{-2}$ s$\text{}^{-1}$ on the phase transformation "austenite-martensite" in the surface layer of hardened 0.36%C-14%Ni steel type with an unbalanced (α+γ)-structure has been determined by an X-ray structure analysis. The mechanisms of (γ-α)-transformation through the depth of steel surface layer and character of this transformation propagation along the specimen length depending on external stress value and tension rate have been defined.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 3; 353-356
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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