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Samples with the addition of ferromagnetic nanoparticles of Pr 2 Co 7 on YBa 2 Cu 3 O y (YBCO) polycrystalline superconductor were prepared by the standard solid state reaction method. The analysis of x-ray diffraction patterns by Rietveld refinement indicates orthorhombique to tetragonal phase transformation and oxygen rate reduction from x=0.3% of Pr 2 Co 7 content. Resistivity at room temperature increases as Pr 2 Co 7 content increases. The normal state resistivity versus temperature was analyzed properly by the bipolaron model. It suggested the increase of mobile charge localization with Pr 2 Co 7 content. Keywords: Pr 2 Co 7 ferromagnetic nanoparticles, high temperature superconductor, bipolaron model, localization of mobile charge

revue des sciences fondamentales et appliquées

The bipolaron model in transport properties of YBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;y&lt;/sub&gt; superconductor prepared by adding Pr&lt;sub&gt;2&lt;/sub&gt;Co&lt;sub&gt;7&lt;/sub&gt; magnetic nanoparticles