Effect of the partial replacement of Ca by alkaline element Na on Tl-1223 superconductor
We have investigated the effect of Na substitution at Ca sites on the lattice parameters, electrical resistivity, magnetic susceptibility and thermopower coefficient for TlBa2Ca2-xNaxCu3O9-δ; with 0 ⩽ x ⩽ 0.4. The lattice parameters elongate with increasing the Na-content. A little enhancement in th...
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| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | , , |
| التنسيق: | conferenceObject |
| منشور في: |
2006
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| الموضوعات: | |
| الوصول للمادة أونلاين: | http://hdl.handle.net/10725/16738 https://doi.org/10.1088/1742-6596/43/1/118 http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php https://iopscience.iop.org/article/10.1088/1742-6596/43/1/118/meta |
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| الملخص: | We have investigated the effect of Na substitution at Ca sites on the lattice parameters, electrical resistivity, magnetic susceptibility and thermopower coefficient for TlBa2Ca2-xNaxCu3O9-δ; with 0 ⩽ x ⩽ 0.4. The lattice parameters elongate with increasing the Na-content. A little enhancement in the superconducting transition temperature Tc has been observed as x increases from 0 to 0.05 and then it depresses gradually for x > 0.05. This observation was attributed to the fact that Na has converted the Tl- 1223 phase from over-doped regime to under-doped regime which is in conformity with the thermopower results, that found to change from negative (over-doped regime) to positive (under-doped regime). The inter-grain critical current density as function of Na has been also reported from ac magnetic susceptibility measurements. |
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