Pb-substitution effects in BSCCO superconductor.

Effect of Co3O4 Nanoparticles Addition on (Bi,Pb)-2223 Superconductor

The effect of nano Co3O4 addition on the superconducting properties of (Bi, Pb)-2223 system was studied. The samples were prepared by the acetate coprecipitation method. The Co3O4 with different sizes (10-30 nm and 30-50 nm) from x=0.00 to 0.05 was added to Bi1.6Pb0.4Sr2Ca2Cu3Oy(Co3O4)x. Phase analysis by XRD method, microstructural examination by SEM and dc electrical resistivity by four point...

Effects of Fe substitution on the transport properties of the superconductor MgB2

A systematic study has been made on the effect of Fe substitution by means of resistivity, thermal conductivity, and Seebeck coefficient of the Mg1−xFexB2 superconductor involving 0%, 0.3%, 0.6%, 1.2%, and 3.0% Fe content. The superconducting transition has been found to be very sharp 0.2 K for a pristine sample and substitution of Fe results in the decrease of TC with the increase in the trans...

خواص مغناطیسی و ساختار ابررسانای (BI2223) آلاییده به سرب آنتیموان

  In a systematic approach, we have investigated the effect of the presence of Pb and Sb in the Bi site in a BSCCO (2223 phase) superconductor. There are some contradictory reports in substitution of Sb in the Bi site. Some researchers report an increase in the Tc of these materials. So, we have made an accurate stoichiometry of these superconductors and selected extra pure starting materials w...

Weak-localization-like effects in superconductor–ferromagnet–superconductor structures

We report measurements of the resistance as a function of temperature and magnetic field in structures containing a narrow (∼2 μm) ferromagnetic strip connecting two superconducting films. The low-field magnetoresistance has a general appearance similar to that expected for weak localization, but the magnitude is much too large to be accounted for in terms of this mechanism. In zero field the r...

Shapiro Steps in BSCCO Intrinsic Josephson Junctions