Comparative study of structural and superconducting properties of (Cu0.5Tl0.5)Ba2Ca2Cu3O10-δ phase substituted by copper fluoride and thallium fluoride

Green-Light GaN p-n Junction Luminescent Particles Enhance the Superconducting Properties of B(P)SCCO Smart Meta-Superconductors (SMSCs)

“…The JC decreased to a minimum at the onset transition temperature TC,on, consistent with the relationship between the critical current JC and temperature T reported in the literature [68,69]. The increase in grain boundaries in the B-series samples prepared from smaller raw material sizes compared to the A-series samples led to poorer connectivity, resulting in a lower critical current density JC for the B-series samples at the same temperature as the A-series samples [66,67]. In addition, from the graphs, it can be seen that, at the same temperature, the critical current density JC of the inhomogeneous phase-doped samples is higher than that of the pure B(P)SCCO samples.…”

“…This results in a decrease in connectivity between the grains and a decrease in the currentcarrying capability between superconducting grains. As a result, the critical temperature T C of the samples decreases [66,67]. However, the reduction in grain size and the increase in grain boundaries allow the B-series samples to accommodate more inhomogeneous phases.…”

Effects of Thallium fluoride substitution on the flux pinning energies of (Cu0.5, Tl0.5)Ba2Ca2Cu3O10-δ superconductors

“…diffraction peaks are mostly associated with the tetragonal structure of the (Cu, Tl)-1223 phase, which has the space group P4/mmm [35] with limited indexed low-intensity peaks suggesting the existence of both the (Cu, Tl)-1212 phase and BaCuO 2 . Kamar et al [34] previously reported on the features and examinations of these samples, and the results are compiled in Table 1.…”

“…On the other hand, T c suppressions for x > 0.1 might well be associated with a boost in the volume fraction of impurity phases, as assisted by XRD analysis. It could also Table 1 The lattice parameters (a and c), the O and F elemental content [34], hole concentration (P), thermoelectric power (S), and fitting parameters for magnetoresistance (β, n, η, and q) of the (Cu 0.5 , Tl 0.5 )-1223 phase with (TlF) x substitution, 0.0 ≤ x ≤ 0.4. be due to the trapping of mobile holes and some mechanisms associated with oxygen vacancy disorder. [41] The estimated values of hole concentration are represented in Table 1.…”

“…The nominal composition of the starting reagents is (Cu0.5[Tl 0.5−x ] Tl2O3 [Tl x ] TlF )Ba 2 Ca 2 Cu 3 O 10−δ F x , where the TlF is used as a source of fluorine to substitute the F ion at the O site and is directly mixed with the other starting reagents from the beginning. The preparation and characterization of the samples have been described in detail elsewhere [34]. The temperature dependence of the resistivity under different magnetic fields ranging from 0.29 to 4.44 kOe at a constant deriving current of 1 mA was obtained by employing the fourprobe method.…”