Superconducting properties of zinc substitution in Tl-2223 phase

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

“…This means that the applied magnetic field is not sufficient to penetrate the intra-grains of superconductor, signifying good electrical contacts between the superconducting grains. These results are in agreement with those obtained by Sedky et al [34] for Re-123 superconductors and Awad et al [10] for Tl-1223 superconducting phase. It is observed that the inter-granular loss peak at p T slightly shifts to lower temperature by increasing the applied field due to losses associated with the motion of inter-granular Josephson tunneling.…”

“…This is because any tiny part of the material going superconductive losses its resistance, and when one or more continuous superconducting paths are in place between the measuring electrodes the resistance equals zero. In contrast, diamagnetic susceptibility measurements depend on macroscopic current loops to shield the magnetic field B from an appreciable fraction of the sample material, and this happens when full superconducting current paths become available [10].…”

“…The behavior of high-temperature superconductors (HTSCs) under the external magnetic fields is of great importance in the engineering application field. Several techniques such as transport, magnetization, and AC susceptibility have been applied to study the complicated flux motions of HTSCs under varying temperatures and fields [10][11][12][13].…”

Effect of Sm-substitution on the electrical and magnetic properties of (Tl0.8Hg0.2)-1223

“…6 for Tl 0.8 Hg 0.2 Ba 2 Ca 2−x Sm x Cu 3 O 9−ı . Here n is the resistivity at 300 K and 0 is obtained from the fitting of resistivity data in the temperature range 165 K ≤ T ≤ 300 K, according to Matthiessen's rule [25]. It is evident that both n and 0 increase as Sm-content increases.…”

Comparison of the superconducting properties of Cu0.5Tl0.5Ba2Ca2(Cu3−yZny)O10−δ prepared at different synthesis temperatures

“…The substitution of non-magnetic Zn þ 2 at Cu þ 2 sites in CuO 2 planes has been found to suppress the superconductivity . It is common consensus that in oxide high T c superconductors, the superconductivity phenomenon takes place in CuO 2 planes and the free carriers interact with the outer most 3d 9 electrons of the copper atoms, which ultimately impart d-wave symmetry to the carriers in their respective conduction bands [32]. Most of these oxide high T c superconductors are an-isotropic and their conductivity parallel to CuO 2 planes (i.e.…”