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1
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Breakdown of the De Gennes Scaling in Y_{1-x}Dy_{x}Ni_{2}B_{2}C

100%
Drzazga Z., Winiarska A., Winiarski A., Kaczorowski D.
Acta Physica Polonica A
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2000
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vol. 97
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issue 1
221-224
EN
Single crystals of Y_{1-x}Dy_{x}Ni_{2}B_{2}C (1 ≤ x ≤ 0.7) were examined by X-ray diffraction and stoichiometry was attested by XPS measurements. The superconducting transition temperature T_{c} and Neel temperature T_{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_{c}
2
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XPS Study of Superconducting LiTi_2O_4 and LiTi_{2-x}Cu_{x}O_4 Sol-Gel Derived Powders and Thin Films

100%
Łapinski M., Kościelska B., Winiarski A., Sadowski W.
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vol. 126
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issue 4a
A-107-A-110
EN
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.
3
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Mixed-Valence State in Yb_2CuGe_6

100%
Szytuła A., Penc B., Konyk M., Winiarski A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1205-1209
EN
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.
4
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Electronic Structure of CePtIn and LaPtIn Compounds

100%
Jezierski A., Penc B., Szytuła A., Winiarski A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 1
212-215
EN
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.
5
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XPS Investigation of Y_{1-x}Dy_xNi_2B_2C Superconductors

100%
Winiarski A., Winiarska A., Drzazga Z.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
243-246
EN
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.
6
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Superconducting Properties of VN-SiO_{2} Sol-Gel Derived Thin Films

76%
Kościelska B., Yuzephovich O., Bengus S., Winiarski A., Sadowski W., Łapiński M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 4
832-835
EN
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.
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