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2 Acta Physica Polonica A

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XPS Investigation of Y_{1-x}Dy_xNi_2B_2C Superconductors

100%

Winiarski A. , Winiarska A. , Drzazga Z.

nr 1

243-246

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.

Anomalous Reversible Torque in Layered Superconducting Bi_{2}Sr_{2}CaCu_{2}O_{x} Single Crystal

100%

Drzazga Z. , Borgieł W. , Szymczak R. , Szymczak H.

Acta Physica Polonica A

1996

tom 89

nr 1

91-98

Magnetic anisotropy of layered superconducting Bi_{2}Sr_{2}CaCu_{2}O_{x} single crystal was investigated by the torque method in the reversible regime. The torque was analyzed in the model taking into account 2D layered structure. Considered model gives the better fit to the data when the magnetic field is applied near (a, b) plane. Obtained results establish to 6×10_{3} value of the superconducting effective mass anisotropy coefficient ε.