Abstract
The flux pinning characteristics of Tl(Ba2−yMgy)Ca2Cu3O10−δ(0.0≤y≤ 1.5) samples have been studied under the influence of various dc magnetic fields in the light of thermally activated flux flow model. It was observed form the magneto resistivity measurements that the activation energy U has been increased in the sample with Mg incorporation of y=0.5, however, it is decreased in the samples with higher Mg doping. This shows that lower Mg doping concentration promotes enhancement, whereas its higher concentration suppresses the flux pinning characteristics of Tl(Ba 2−yMg y)Ca 2Cu 3O10−δ (0.0 ≤y≤1.5) samples. The excess conductivity analysis of Tl(Ba 2−yMg y)Ca 2Cu 3O10−δ (0.0 ≤ y ≤ 1.5) samples has shown that the coherence length along the c-axis ξc(0), the interlayer coupling J, the phase relaxation time of the carriers τϕ, and the Fermi velocity vF of the carriers are suppressed with Mg doping. However, the values of Bc0(T), Bc1(T), and Jc(0) are enhanced which complement the magnetoresistivity analysis. These results showed that the flux pinning characteristics are enhanced for lower doping concentration of Mg at the charge reservoir layer sites.
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