Excess Conductivity and Critical Physical Parameters of Y Substituted Ca Site of Bi: 2223 High Tc Superconductors
Journal Title: Asian Journal of Physical and Chemical Sciences - Year 2017, Vol 3, Issue 2
Abstract
We presented here the fluctuation induced excess conductivity in Bi1.7Pb0.3Sr2Ca2-xYxCu3Oy superconductors with various x values (0.00 < x < 0.50). The logarithmic plots of excess conductivity (∆σ) and reduced temperature (ε) reveal three different values of the order parameter dimensional exponents against a decrease of temperature corresponding to two different values of crossover temperatures. In the critical field region, the order parameter exponents are two dimensional (2D) as x increases up to 0.20, but it is changed to three dimensional (3D) with further increase of x up to 0.50. While, the order parameter exponents are not systematic with Y in both normal and mean field regions, and they are fluctuated between zero dimensional /short wave (0D/SW), qusi-2D, qusi-1D and 3D. On the other hand, the coherence lengths, inter-plane spacing, interlayer coupling, G-L parameter and anisotropy are calculated and their values are generally increased by increasing x up to 0.50, whereas G-L parameter, Ginsburg number, critical magnetic fields and critical current density are decreased. The possible reasons for the above findings are also mentioned.
Authors and Affiliations
A. Sedky, Amna Salah, S. A. Amin
Keywords
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- EP ID EP338833
- DOI 10.9734/AJOPACS/2017/36244
- Views 69
- Downloads 0
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