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    Wyświetlanie 1-6 z 6
    Tytuł:
    Thin Film Manganite-Metal Interconnection and "Loop Effect" Studies in CMR-Based High Magnetic Field Sensors
    Autorzy:
    Balevičius, S.
    Stankevič, V.
    Žurauskienė, N.
    Šimkevičius, Č.
    Liebfried, O.
    Löffler, M.
    Schneider, M.
    Abrutis, A.
    Plaušinaitienė, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807946.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    75.47.Lx
    85.70.Ay
    Opis:
    The design, technology and main characteristics of Ag contacts as well as "loop effect" peculiarities of colossal magnetoresistance B-scalar high magnetic field sensor based on $La_{1-x}(Ca)Sr_x$ $MnO_3$ films used for measuring high magnetic field pulses are presented.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1133-1135
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Studies of Excitonic Complexes in Atomically Thin $Mo(S_y Se_{1-y})_2 $ Alloys
    Autorzy:
    Jadczak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398343.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    Transition metal dichalcogenides monolayers
    exciton
    trion
    phonon
    Opis:
    Transition metal dichalcogenides show new emergent properties at monolayer thickness, notably strong Coulomb and electron-phonon interactions enable new insight into physics of many body effects. Here, we report photoluminescence and reflectivity contrast measurements of excitons (X) and trions (T) and the Raman spectra of phonons in monolayers of $Mo(S_ySe_{1-y})_2$ alloys with sulfur mole content from y=0 up to y=1. Binary MoSe₂ and ternary $Mo(S_ySe_{2-y})$ alloys exhibit contrasting behavior in the temperature evolution of excitons and trions photoluminescence intensity from T=7-295 K. In MoSe₂ a trion dominates photoluminescence spectra at low temperatures but exciton dominates photoluminescence at higher temperature. In contrast, in ternary $Mo(S_ySe_{1-y})_2$ alloys and MoS₂ trions dominate photoluminescence spectra at all measured temperatures, with the trion to exciton photoluminescence intensity ratio increasing with sulfur content. We attribute the strong increase of the trion photoluminescence intensity in $Mo(S_ySe_{1-y})_2$ monolayers with increase of sulfur mole content to the significant increase of the two-dimensional electron gas concentration and also to the strong exciton-trion coupling mediated by an optical phonon. We also demonstrate that increasing sulfur content in $Mo(S_ySe_{1-y})_2$ alloys stabilizes total photoluminescence intensity at high temperature.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 307-312
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Mechanical Studies of Bond and Molecular Polarizabilities of Gas-Phase Metal Halides
    Autorzy:
    Pandey, A. N.
    Bigotto, A.
    Gulati, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891514.pdf
    Data publikacji:
    1991-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.10.+z
    31.90.+s
    Opis:
    The bond and molecular polarizabilities are studied for the gas-phase metal halides using delta-function potential model of chemical binding on the basis of quantum mechanical approach. The applicability of the model is demonstrated. The contribution of the polarity corrections for the metal halides is thoroughly investigated and it has been found that it plays a significant role for fluorides. Our polarizability calculations resolve the discrepancy about the conformation of the barium dichloride and mercury dichloride and favour the nonlinear structure. Due to lack of experimental results for most of halides of transition metals, the decision whether to incorporate polarity corrections or not remains uncertain at this stage: we must await measurements of more experimental values before we reach any final conclusion. The ionic bond orders have been used for the first time to investigate polarizabilities of monomers and dimers of alkali halides. The results for dimers reveal that polarity contribution is essential for the lithium halides dimers and not for other dimers. The computed results will be asset for the interpretation of experimental measurements.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 4; 503-520
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and ESR Studies of GaN Layers Grown by Metal Organic Chemical Vapour Deposition
    Autorzy:
    Suchanek, B.
    Palczewska, M.
    Pakuła, K.
    Baranowski, J.
    Kamińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968425.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    73.61.Ey
    Opis:
    Electrical transport and ESR studies were performed on the state-of-theart GaN layers grown on sapphire substrate using metal organic chemical vapour deposition technique. For undoped samples electron concentration below 2×10$\text{}^{17}$ cm$\text{}^{-1}$ and mobility up to 500 cm$\text{}^{2}$/(V s) were achieved whereas hole concentration up to 7×10$\text{}^{17}$ cm$\text{}^{-3}$ and mobility about 16 cm$\text{}^{2}$/(V s) were obtained for intentionally Mg doped samples and subsequently annealed. Temperature dependence of mobility was discussed. ESR revealed the presence of two resonance absorption lines. One of them with g$\text{}_{⊥}$=1.9487 and g$\text{}_{∥}$=1.9515, commonly observed in n-type GaN was due to shallow donor. The second ESR line was an isotropic one of g=2.0032 and it is discussed.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1001-1004
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Response of Metal - Porous Silicon Structures to Microwave Radiation
    Autorzy:
    Stupakova, J.
    Ašmontas, S.
    Gradauskas, J.
    Zagadskij, V.
    Shatkovskis, E.
    Sužiedėlis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047172.pdf
    Data publikacji:
    2006-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.30.+q
    78.55.Mb
    85.30.De
    Opis:
    Structures containing layers of porous silicon with two metal contacts are investigated. Porous silicon is manufactured by anodizing p-type crystalline silicon plates of resistivity of 0.4 Ω cm. Contacts for the samples are made by additional boron doping of the surface and by thermal evaporation of aluminium. Resistance and current-voltage characteristics are investigated. Response of the porous silicon layer containing structures under action of pulsed microwave radiation was investigated for the first time. The origin of the response is discussed.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 6; 817-822
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and structural studies into the effect of solvent exchange process in metal-organic framework MOF-76(Gd)
    Autorzy:
    Almáši, M.
    Zeleňák, V.
    Zeleňáková, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054760.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.75.Fk
    65.40.gd
    Opis:
    Effect of solvent exchange/absence on magnetic and structural properties of microporous metal-organic framework MOF-76(Gd) has been performed. Three compounds have been prepared and characterized: as synthesized MOF-76(Gd)-DMF, which containing DMF (N,N'-dimethylformamide) and H₂O molecules in the cavity system, activated complex without solvents, MOF-76(Gd) and water exchanged sample MOF-76(Gd)-H₂O. The structural study showed that compounds undergo structural changes after activation/exchange processes. Changes were mainly observed in the magnetic properties and distances between Gd...Gd ions: 4.718 Å for MOF-76(Gd)-DMF, 4.326 Å for MOF-76(Gd)-H₂O and 4.296 Å for MOF-76(Gd). The magnetic properties of the samples were studied by magnetic susceptibility χ_{M}(T) and magnetization M(H). The low positive value of the Weiss constant, Θ = 1.54 K in compound MOF-76(Gd)-DMF shows on a very weak ferromagnetic interaction. On the contrary, the negative values of Θ in complexes MOF-76(Gd) (-5.58 K) and MOF-76(Gd)-H₂O (-6.23 K) confirm the existence of antiferromagnetic exchange interaction between Gd(III) ions.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 991-993
    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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