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Wyszukujesz frazę "Winiarski, A." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    XPS Investigation of $Y_{1-x}Dy_xNi_2B_2C$ Superconductors
    Autorzy:
    Winiarski, A.
    Winiarska, A.
    Drzazga, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812333.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    74.25.Jb
    74.70.-b
    82.80.Pv
    Opis:
    The analysis of the valence band photoemission spectra of $Y_{1-x}Dy_xNi_2B_2C$ (0≤x≤1) is presented. The valence bands are mainly plotted for Ni 3d, Y 4d and Dy 4f contributions, according to theoretical predictions. The valence bands of $Y_{1-x}Dy_xNi_2B_2C$ compounds markedly change shape with the x parameter, especially in the binding energy region from 3 eV to 14 eV. For large content of Dy (above 55%) the valence band is predominant by Dy 4f states whereas Ni 3d states govern the valence band of yttrium rich compounds. Changing in domination of valence sub-band correlates with plot of superconducting transition temperature $T_c$ with Dy concentration.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 243-246
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure of CePtIn and LaPtIn Compounds
    Autorzy:
    Jezierski, A.
    Penc, B.
    Szytuła, A.
    Winiarski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419892.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    71.27.+a
    79.60.-i
    Opis:
    The electronic structure of the ternary RPtIn (R = La, Ce) compounds, which crystallize in the hexagonal ZrNiAl-type structure, was studied by X-ray photoelectron spectroscopy measurements and calculation using the ab initio methods (linear muffin-tin orbital in the atomic sphere approximation, full potential linear muffin-tin orbital, full potential linear orbital). The results showed that the valence band in these compounds is formed by the Pt 5d and In 5s and 5p states. The band calculations with spin-orbit coupling have shown that the Ce 4f peaks consist of two peaks above the Fermi level that correspond to the $Ce 4 f_{7/2}$ and $4 f_{5/2}$ doublet and wide peaks corresponding to the La 4f states. The analysis of Ce 3d spectra on the basis of the Gunnarsson-Schönhammer model gives hybridization of 4f orbitals with the conduction electron band equal to 170 meV.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 212-215
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Breakdown of the De Gennes Scaling in Y$\text{}_{1-x}$Dy$\text{}_{x}$Ni$\text{}_{2}$B$\text{}_{2}$C
    Autorzy:
    Drzazga, Z.
    Winiarska, A.
    Winiarski, A.
    Kaczorowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012891.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.72.-h
    82.80.Pv
    Opis:
    Single crystals of Y$\text{}_{1-x}$Dy$\text{}_{x}$Ni$\text{}_{2}$B$\text{}_{2}$C (1 ≤ x ≤ 0.7) were examined by X-ray diffraction and stoichiometry was attested by XPS measurements. The superconducting transition temperature T$\text{}_{c}$ and Neel temperature T$\text{}_{N}$ were determined by means of magnetisation measurements. A dramatic breakdown of the de Gennes scaling in the Dy-rich compounds was found when T$\text{}_{c}$
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 221-224
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XPS Study of Superconducting $LiTi_2O_4$ and $LiTi_{2-x}Cu_{x}O_4$ Sol-Gel Derived Powders and Thin Films
    Autorzy:
    Łapinski, M.
    Kościelska, B.
    Winiarski, A.
    Sadowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374065.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.78.-w
    81.20.Fw
    Opis:
    In this work X-ray photoelectron studies of lithium titanate and copper doped lithium titanate are presented. Both, powder and thin films samples were prepared by sol-gel method. After preparation, the samples were heated in argon atmosphere at various temperatures in a range from 500 °C to 600 °C for 20 h. The crystalline structure of the samples was investigated by X-ray diffraction, while the oxidation states of the elements were examined by X-ray photoelectron spectroscopy method. X-ray diffraction measurements confirmed spinel phase of all manufactured samples. However it is well known that electrical and superconducting properties of lithium titanate are strongly correlated not only with structure, but also with oxidation state of Ti ions. X-ray photoelectron spectroscopy investigations revealed mixture of $Ti^{3+}$ and $Ti^{4+}$ ions, although the $Ti^{3+}$/$Ti^{4+}$ ratio is much smaller than $1/2$ needed for superconductivity. In this work dependence between calcination temperature as well as amount of Cu dopant and $Ti^{3+}$/$Ti^{4+}$ proportion are reported.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-107-A-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed-Valence State in $Yb_2CuGe_6$
    Autorzy:
    Szytuła, A.
    Penc, B.
    Konyk, M.
    Winiarski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813177.pdf
    Data publikacji:
    2008-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    75.20.Hr
    79.60.-i
    Opis:
    We present here temperature dependent X-ray photoemission measurements on polycrystalline $Yb_2CuGe_6$. The analysis of these data shows the change in the effective valence, determined directly from the 4f intensity ratio, as a function of temperature.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 4; 1205-1209
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting Properties of $VN-SiO_{2}$ Sol-Gel Derived Thin Films
    Autorzy:
    Kościelska, B.
    Yuzephovich, O.
    Bengus, S.
    Winiarski, A.
    Sadowski, W.
    Łapiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431327.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Fw
    74.78.-w
    Opis:
    In this work studies of structure and superconducting properties of $VN-SiO_{2}$ films are reported. The films were obtained through thermal nitridation (ammonolysis) of sol-gel derived $V_{2}O_{3}-SiO_{2}$ coatings (in a proper $V_{2}O_{3}//SiO_{2}$ ratio) at 1200°C. This process leads to the formation of disordered structure with VN metallic grains dispersed in the insulating $SiO_{2}$ matrix. The structural transformations occurring in the films as a result of ammonolysis were studied using X-ray photoelectron spectroscopy (XPS). The critical superconducting parameters are obtained. The magnetoresistance at high magnetic fields has been investigated.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 832-835
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Pressure Effects on Electronic Structure of Iron Chalcogenide Superconductors $FeSe_{1-x}Te_x$
    Autorzy:
    Ciechan, A.
    Winiarski, M.
    Samsel-Czekała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431323.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Pq
    74.25.Kc
    74.62.F
    74.70.Xa
    Opis:
    We study the electronic structure of iron-based superconductors $FeSe_{1-x}Te_x$ within the density functional theory. We pay particular attention to the pressure effects on the Fermi surface (FS) topology, which seem to be correlated with a critical superconducting temperature $T_C$ of iron chalcogenides and pnictides. A reduction of the FS nesting between hole and electron cylinders with increasing pressure is observed, which can lead to higher values of $T_C$. The tellurium substitution into selenium sites yields FS changes similar to the pressure effect.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 820-823
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Resistance of Magnetoelastic Characteristics of 13CrMo4-5 Constructional Steel
    Autorzy:
    Jackiewicz, D.
    Kachniarz, M.
    Rozniatowski, K.
    Dworecka, J.
    Szewczyk, R.
    Salach, J.
    Bienkowski, A.
    Winiarski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387805.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.25.Hf
    07.55.-w
    75.30.-m
    Opis:
    In the paper the results of investigation on tensile stresses dependence of magnetoelastic characteristics of cores made of 13CrMo4-5 constructional steel are presented. In the investigation step-cooling test treated samples were used. The step-cooling test process is a type of heat treatment simulating effects of passing time and environmental conditions (temperature and stress) on the sample. In the paper the method of testing the influence of stresses on the magnetic characteristics is presented. Frame shaped samples ensured a closed magnetic circuit and homogeneous distribution of stress. It was found that step-cooling test does not significantly influence the magnetoelastic characteristics and the structure of the samples. On the other hand, then tensile stresses significantly change the magnetic characteristics of 13CrMo4-5 constructional steel. That confirms the possibility of using measurements based on the magnetoelastic effect in the stress assessment for industrial non destructing testing of steel constructions.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 614-616
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Thermomagnetic Treatment on Magnetoelastic Properties of FeNiMoB Amorphous Alloy
    Autorzy:
    Szewczyk, R.
    Svec, P.
    Salach, J.
    Švec, P.
    Bieńkowski, A.
    Hoško, J.
    Jackiewicz, D.
    Kamiński, M.
    Winiarski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366528.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.80.+q
    75.50.Kj
    Opis:
    Paper presents the results of magnetoelastic tests of ring-shaped cores made of $Fe_{40}Ni_{38}Mo_{4}B_{18}$ amorphous alloy. The cores were subjected to thermomagnetic annealing under different values of magnetic field. The obtained results enabled us to connect the magnetoelastic characteristics of $Fe_{40}Ni_{38}Mo_{4}B_{18}$ amorphous alloy with the conditions of thermomagnetic treatment of the material.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 52-53
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Thermomagnetic Treatment on the Magnetoelastic Characteristics of Fe₆₁Co₁₉Si₅B₁₅ Amorphous Alloys
    Autorzy:
    Salach, J.
    Szewczyk, R.
    Svec Sr, P.
    Bieńkowski, A.
    Jackiewicz, D.
    Svec, P.
    Nowicki, M.
    Winiarski, W.
    Kachniarz, M.
    Gruszecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387877.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.80.+q
    75.50.Kj
    Opis:
    Information about magnetoelastic properties of newly developed amorphous magnetic alloys is very important from practical point of view, especially in the case of high permeability materials such as the Fe₆₁Co₁₉Si₅B₁₅ amorphous alloy. In the case of such materials, effect connected with the influence of external stresses on the magnetic properties of the alloy should be tested. This paper presents experimental results of the magnetoelastic properties investigation of the Fe₆₁Co₁₉Si₅B₁₅ amorphous alloy, annealed without magnetic field as well as in the magnetic field. Such thermo-magnetic treatment generated anisotropy has significant influence on the total free energy of magnetic material. In the magnetoelastic investigation, the compressive stress was applied to the ring shaped core, perpendicularly to the magnetizing field direction. Due to the fact, that cores with closed magnetic circuits were used, demagnetization did not change the balance of total free energy in the material.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 617-619
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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