اثر الاستبدال الجزئي ل CuO ، ب KMnO4 في خصائص الناقل الفائق في الطور (Hg,Tl) - 2223

Hg-based superconducting compounds are a very important subject for studying the fundamental aspects of the high -Tc superconductivity in layered cuprates. They have high critical temperature. In this work we are focusing on partial replacement of Hg by Tl and of CuO by KMnO4 by using a solid state reaction technique in a sealed quartz tube under normal pressure. Samples of the type (Hg1-x,Tlx)2Ba2Ca2(Cu1-zRz)3Oδ+6,where R=KMnO4 were prepared; x=0.1 and z=0,0.15,0.25. The electrical resistivity R(T) was measured as a function of temperature using the conventional DC four probe technique in the temperature range from 10 K to 300 K. The superconducting parameters, such as superconducting transition width DT and activation energy U(B) as a function of magnetic field are calculated