Critical temperature of an anisotropic superconductor containing both nonmagnetic and magnetic impurities

The combined effect of both nonmagnetic and magnetic impurities on the superconducting transition temperature is studied theoretically within the BCS model. An expression for the critical temperature as a function of potential and spin-flip scattering rates is derived for a two-dimensional superconductor with arbitrary in-plane anisotropy of the superconducting order parameter, ranging from isotropic s-wave to d-wave (or any pairing state with nonzero angular momentum) and including anisotropic s-wave and mixed (d+s)-wave as particular cases. This expression generalizes the well-known Abrikosov-Gor'kov formula for the critical temperature of impure superconductors. The effect of defects and impurities in high temperature superconductors is discussed.Comment: 4 eps figure

The influence of sputtering time and oxygen partial pressure on electrical resistivity of Bi:2201 thin films

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

MAGNETIC BEHAVIOUR OF SOME LEAD-BORATE GLASSES WITH MANGANESE IONS

The magnetic susceptibility measurements have been performed on xMnO. (1 - x) [2B2O3.PbO] glasses with 0 30 mol %, the manganese ions experience magnetic interactions. From Curie constant values and qualitative chemical analysis we have established that in these glasses Mn2+ and Mn3+ ions are present, which explains their magnetic behaviour

Transport phenomena in (Bi1.6Pb0.4)(Sr1.8Ba0.2)Ca 2(Cu1-xFex)3Oy thin films

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Hall effect in bulk YBa2(Cu1-xZnx)3O7-δ

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Electrical characterization of epitaxial Bi:2201 thin films deposited on MgO substrates using inverted cylindrical magnetron sputtering

Bi2.1Sr1.9CuOy thin films (Bi:2201) were deposited onto heated single crystal (100) MgO substrates using inverted cylindrical DC magnetron sputtering with different partial pressures of oxygen in a sputtering gas. The behavior of the normal state resistivity function of temperature is strongly influenced by the composition of sputtering gas used in thin films synthesis. Near the transition to the superconducting state, electrical resistivity changes strongly from "metallic" to insulator (MI). The origin for the increase of electrical resistance was analyzed using some models for the localization of mobile carriers. A good linearity is obtained for 1n R as a function of Tα for α = 1/10 and for R as a function of 1n T. The last behavior agrees with the pinning and fragmentation of 1D stripes in CuO2 planes.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Superconducting and normal-state transport properties in bulk YBaCuO, doped with Zn

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Transport properties of the YBa2(Cu1-xFex)Oy

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The thermal treatement influence on the electrical resistance of underdoped YBa2(Cu0.96Fe0.04)3Oy superconductor

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Effect of 3d element substitution on inter- and intragrain critical temperatures in (bi,pb):2223 system

The inter- and intragrain critical temperatures are differently affected by the natur and concentration of the 3d substituent (Fe,Ni,Zn) for Cu. Decrease of these temperatures is in agreement with the increase in residual resistivity.SCOPUS: ar.jinfo:eu-repo/semantics/publishe