Study of Electric Resistance and Magnetoresistance for Agx(Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ Superconductors | ||
| Egyptian Journal of Solids | ||
| Article 3, Volume 24, Issue 1, 2001, Pages 21-31 PDF (278.3 K) | ||
| DOI: 10.21608/ejs.2001.150490 | ||
| Abstract | ||
| Superconducting samples of the type Agx(Tl0.8Pb0.1Bi0.1) Ba2Ca2O9-δ with (0< x < 0.4) are prepared from the high purity oxides Tl2O3, PbO, Bi2O3, BaO2, CaO, CuO, and Ag metal at 870oC for 4h. The characterization, electric resistance and magnetoresistance for the prepared samples are performed. Ag addition to (Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ shows a reduction in both lattice parameters "a" and "c" while the grain size is improved till about x=0.2. Resistance data show that the superconducting critical temperature "Tc" has little variation with increasing silver addition. Oxygen annealing of these samples causes an improvement in zero resistance temperature "T0". The excess conductivity studies show that there are three-dimension fluctuations (3D) in the mean field region for either pure sample or samples containing Ag. As the silver addition increases the transverse magentoresistance decreases till x=0.2 and then increases. Transverse magnetoresistance vs. applied magnetic field at different temperatures shows a decrease as the temperature reaches the superconducting critical temperature. The driving current has an effect in the value of magnetoresistance near the zero resistance temperature but it does not affect the value of the magnetoresistance near the superconducting critical temperature. | ||
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