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    Wyświetlanie 1-12 z 12
    Tytuł:
    Evaluation of Positron Implantation Profiles in Various Materials for ²²Na Source
    Autorzy:
    Dubov, L.
    Akmalova, Yu.
    Stepanov, S.
    Shtotsky, Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030040.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.70.Uu
    29.90.+r
    Opis:
    Positron implantation profiles in various materials for ²²Na isotope source are discussed. The spatial distribution of positrons in materials with densities from 1 to 21 g/cm³ are simulated using GEANT4 code. The results indicate that depth distributions of thermalized positrons in any homogeneous medium can be described by the sum of two exponential functions. Contribution of the short-range exponent is about 11% in the materials. The both absorption coefficients can be well represented as a function of material density and atomic number. Proposed empirical model agrees well with available experimental data.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1482-1485
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Mesoscopic Gate
    Autorzy:
    Popov, I. Yu.
    Popova, S. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943940.pdf
    Data publikacji:
    1995-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    Opis:
    The possibility of constructing of mesoscopic gate controlled by external electric field is shown.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 6; 1113-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-Linear Processes in 1D Quantum Spin Ordered System under Strong Magnetic Field Pulse
    Autorzy:
    Borovikov, V. S.
    Gorelik, L. Yu
    Kulinich, S. I.
    Popkov, V. Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963291.pdf
    Data publikacji:
    1997-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Tx
    75.30.Mb
    Opis:
    Investigation of an exactly integrable quantum model of 1D magnetic (which is equivalent to a massive fermion system) is presented. It has been shown that under certain conditions a spin system will not absorb power from the strong homogeneous magnetic field pulse.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 3; 605-608
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Primary Radiolytic Reactions in the Auger Blob Formed by Radioactive Transformation of $\text{}^{57}Co$ into $\text{}^{57}Fe$ in Frozen Aqueous Medium
    Autorzy:
    Stepanov, S.
    Perfil'ev, Yu.
    Byakov, V.
    Kulikov, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382326.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    82.50.Kx
    82.80.Ej
    Opis:
    The emission of the Auger electrons during the formation of the Mössbauer nucleus $\text{}^{57}Fe$ leads not only to the formation of multicharged $\text{}^{57}Fe^{n+}$ ion, but also to the appearance of the Auger blob, a cloud of several hundreds of ion-electron pairs ($H_2O^{+}$, e¯) in the solvent around the Fe ion. Fast radiation-chemical reactions therein determine the experimentally observable ratio of the yields of final chemically stable charged states of the Mössbauer ions ($Fe^{3+}$ and $Fe^{2+}$). This ratio strongly depends on reaction rates constants between $H_2O^{+}$, e¯, and the solute S. We have shown that in contrast to radiation chemical data the reactivity of $NO_{3}^{-}$ anions with quasi-free track electrons in frozen aqueous solutions exceeds those of $H_{3}O^{+}$, $ClO_{4}^{-}$, and $HSO_{4}^{-}$ ions only by a factor of three instead of ≈ 100 which follows from the radiation chemical experiments.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 843-845
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-Induced Transparency in 1D Magnetics
    Autorzy:
    Borovick, A. E.
    Borovikov, V. S.
    Gorelik, L. Yu
    Powiązania:
    https://bibliotekanauki.pl/articles/1930595.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Mb
    74.70.Tx
    Opis:
    The evolution of spin system with the Fermi character of the relevant excitations under the strong magnetic field pulse is presented. The nonlinear dynamic equations describing interaction of the system and external magnetic field are found. It is shown that under certain conditions the initial state of the resonantly absorbing system does not change after passing of the field pulse (similar to optical self-induced transparency in two-level molecular gas).
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 405-407
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Annealing Effect of Equiatomic Co/Pt Alloy Films
    Autorzy:
    Gontarz, R.
    Luciński, T.
    Uba, L.
    Uba, S.
    Kudryavtsev, Yu. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930605.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Ef
    75.70.Fr
    61.50.Ks
    Opis:
    Polycrystalline as-sputtered CoPt alloy films near the equiatomic composition were characterized as consisting of a disordered fcc phase with preferred texture along [111] orientation perpendicular to the film plane. The film annealing at 600°C/16 h induces the disorder-order phase transition confirmed by X-ray diffraction. As a result of the transition an appearance of the ordered tetragonal (fct) phase of AuCuI type with c/a = 0.974 is observed. The c-axis is the easy axis of magnetization. Both longitudinal and polar Kerr hysteresis loops reveal a dramatic increase in the coercivity from 0.1 to 4.5 kOe in annealed CoPt alloy films due to ordering.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 427-431
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Behaviour of PrCo_{1-x}Fe_xO₃ Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements
    Autorzy:
    Pekinchak, O.
    Sugak, D.
    Ubizskii, S.
    Suhak, Yu.
    Fritze, H.
    Vasylechko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029711.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Fn
    61.05.cp
    65.40.De
    72.60.+g
    Opis:
    Crystal structure and transport properties of the mixed praseodymium cobaltites-ferrites PrCo_{1-x}Fe_xO₃ have been studied in the temperature range of 298-1173 K by a combination of in situ X-ray synchrotron powder diffraction and temperature dependent impedance spectroscopy measurements. In situ high temperature powder diffraction examination of PrCo_{1-x}Fe_xO₃ series revealed considerable anomalies in the lattice expansion which are especially pronounced for the cobalt-rich specimens. These anomalies, which are reflected in a sigmoidal dependence of the unit cell dimensions and in the considerable increase of the thermal expansion coefficients, are obviously associated with transitions of Co^{3+} ions from low spin to the higher spin states and the coupled metal-insulator transitions, occurring in in rare earth cobaltites at the elevated temperatures. Indeed, the temperature-dependent impedance measurements clearly prove the change of conductivity type from dielectric to the metallic behaviour in the mixed cobaltite-ferrites PrCo_{1-x}Fe_xO₃ at the elevated temperatures.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 798-801
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MOCVD of High Quality LuBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ Thin Films
    Autorzy:
    Samoylenkov, S. V.
    Gorbenko, O. Yu.
    Graboy, I. E.
    Kaul, A. R.
    Svetchnikov, V. L.
    Zandbergen, H. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964530.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Hi
    68.55.-a
    Opis:
    Epitaxial LuBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ films were prepared by flash evaporation MOCVD on LaAlO$\text{}_{3}$, SrTiO$\text{}_{3}$, LaSrGaO$\text{}_{4}$ and ZrO$\text{}_{2}$(Y$\text{}_{2}$O$\text{}_{3}$) single crystalline substrates. The highest T$\text{}_{c}$ and j$\text{}_{c}$ (77 K, 100 Oe) values were 89 K, 2.7×10$\text{}^{6}$ A/cm$\text{}^{2}$ (LaAlO$\text{}_{3}$) and 88 K, 1.5×10$\text{}^{6}$ A/cm$\text{}^{2}$ (SrTiO$\text{}_{3}$) respectively. The occurrence of secondary phases inclusions in LuBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ films correlates with the possibility of epitaxial relations with the film matrix or the substrate.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 243-247
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling in Semiconductor EuS-PbS Ferromagnetic Wedge Multilayers
    Autorzy:
    Kowalczyk, L.
    Wrotek, S.
    Dziawa, P.
    Osinniy, V.
    Szot, M.
    Story, T.
    Sipatov, A. Yu.
    Volobuev, V. V.
    Fedorov, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046924.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Antiferromagnetic interlayer coupling between ferromagnetic layers of EuS via nonmagnetic PbS spacer layer was experimentally studied in EuS-PbS wedge multilayers grown on KCl (001) substrates with EuS thickness of 6 nm and PbS thickness varying in the wedges in the range 0.3-6 nm (i.e. n=1-20 monolayers). Measurements of magnetic hysteresis loops of EuS-PbS multilayers performed in the temperature range 5-30 K by superconducting (SQUID) and magneto-optical magnetometers revealed a rapid increase in saturation magnetic field in multilayers with PbS spacer thinner than about 1.5 nm. It shows a monotonic increase in interlayer coupling strength with a decreasing PbS spacer thickness, in qualitative agreement with 1/2$\text{}^{n}$ dependence predicted theoretically for semiconductor magnetic superlattices.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 225-231
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity of Non-Strained PbTe-PbS and Strained PbTe-SnTe Superlattices
    Autorzy:
    Mironov, O. A.
    Chistyakov, S. V.
    Fedorenko, A. I.
    Shpakovskaya, L. P.
    Sipatov, A. Yu.
    Savitskii, B. A.
    Nashchekina, O. N.
    Oszwałdowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890800.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.-c
    73.60.Fw
    74.60.-w
    Opis:
    A comparative study of structural and superconductive properties of semi conductor epitaxial superlattices PbTe-SnTe and PbTe-PbS grown on (001) KCl has been carried out. It has been found that the superconductivity of the PbTe-SnTe superlattices is caused by the stretching strain in the SnTe layers and it may be connected with the relative positions of L$\text{}_{8}^{+}$ and L$\text{}_{6}^{+}$ terms of PbTe and SnTe, respectively in the heterojunction. In contrast to the PbTe-SnTe superlattices, the superconductivity of the PbTe-PbS super lattices is found to be associated with regular misfit dislocation grids which are generated at the interfaces.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 329-332
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiopurity of $ZnWO_4$ Crystal Scintillators
    Autorzy:
    Belli, P.
    Bernabei, R.
    Cappella, F.
    Cerulli, R.
    Danevich, F.
    Dubovik, A.
    d'Angelo, S.
    Galashov, E.
    Grinyov, B.
    Incicchitti, A.
    Kobychev, V.
    Nagornaya, L.
    Nisi, S.
    Nozzoli, F.
    Poda, D.
    Podviyanuk, R.
    Prosperi, D.
    Shlegel, V.
    Tretyak, V.
    Vasiliev, Ya.
    Vostretsov, Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550381.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.40.Mc
    23.40.-s
    Opis:
    Recently $ZnWO_4$ was proposed as perspective material for low-counting experiments to search for rare processes. Such experiments demand high radiopurity of $ZnWO_4$ crystal scintillators. With this aim radioactive contamination of large volume (0.1-0.7 kg) $ZnWO_4$ crystal scintillators were measured in the underground Laboratori Nazionali del Gran Sasso of the INFN at the depth of ≈ 3600 m water equivalent.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 139-142
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Structural Properties of EuS-PbS Multilayers Grown on n-PbS (100) Substrates
    Autorzy:
    Chernyshova, M.
    Łusakowska, E.
    Domukhovski, V.
    Grasza, K.
    Szczerbakow, A.
    Wrotek, S.
    Kowalczyk, L.
    Story, T.
    Smits, C. J. P.
    Swagten, H. J. M.
    De Jonge, W. J. M.
    Palosz, W.
    Sipatov, A. Yu.
    Volobuev, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035589.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Magnetic properties of semiconductor EuS(t)-PbS(d)-EuS(t) ferromagnetic trilayers (t=30÷300Å and d=7.5÷70Å) grown on n-type monocrystalline PbS (100) substrate were studied by SQUID magnetometry and ferromagnetic resonance technique yielding, in particular, the dependence of the ferromagnetic Curie temperature on the thickness of the EuS layer. Structural parameters of layers were examined by X-ray powder diffraction analysis. A high structural quality of the substrate and the multilayer was verified by the measurements of the X-ray rocking curve width indicating the values of the order of 100 arcsec and by atomic force microscopy revealing the presence on the cleft PbS surface regions practically flat in the atomic scale over the area of 1×0.1μm$\text{}^{2}$.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 609-615
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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