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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.
2
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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}
3
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Structural and Magnetic Properties of Dy(Fe,V,Si)_{12} Compounds

100%
Drzazga Z., Winiarska A., Chrobak A., Kaczorowski D.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
335-339
EN
An influence of Si on the structural and magnetic properties of Dy(Fe,V,Si)_{12} compounds is studied. X-ray diffraction shows that these materials crystallise in the tetragonal ThMn_{12}-type structure. An increase in the saturation magnetization, the Curie temperatures and magnetocrystalline anisotropy in the Si substitutional systems is observed when compared with DyFe_{12-x}V_{x}. The magnetic properties depend on the preferential site occupation and concentration of Si and V atoms in these compounds.
4
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Magnetic Anisotropy of UFe_{10-x}Ni_{x}Si_{2} Intermetallic Alloys

88%
Drzazga Z., Suski W., Wochowski K., Wójcik J., Winiarska A.
Acta Physica Polonica A
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2000
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vol. 98
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issue 5
555-560
EN
The magnetic anisotropy in UF_{10-x}Ni_{x}Si_{2} series has been studied by torsion magnetometry and initial ac magnetic susceptibility measurements in the temperature range of 77-293K. The effective anisotropy constant changes with Ni content showing some increase for intermediate concentration. An increase in magnetic anisotropy energy at low temperatures is due to the uranium sublattice ordering. Magnetic anisotropy behaviour in UFe_{2}Ni_{8}Si_{2} is influenced by an additional enhancement of the 3d sublattice connected with the ordering Fe magnetic moments.
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