Superconductivity in YBa2−xSrxCu3O7−δ

Abstract

Effect of silver solubility on microstructure and superconducting properties of YBa2Cu3−x Ag x O7−δ superconductors

Magnetization and magneto-resistance in Y(Ba1−xSrx)2Cu3O7−δ(x= 0.00–0.50) superconductors

“…For x = 0.50 it again decreases in agreement with earlier studies [2][3][4][5][6]. However, small impurity phases arises in x = 0.50 composition as increasing Sr content results in an unstable 123 phase.…”

“…According to Ona et.al [4] the O content decreases slightly in Sr doped samples due to structural disturbances. Along with decrease in O content, reduction in cell volume causes decrease in T c [2][3][4][5][6]. Veal et.al [5] accounted this T c reduction to local structure distortions occurred due to Sr doping.…”

“…Along with decrease in O content, reduction in cell volume causes decrease in T c [2][3][4][5][6]. Veal et.al [5] accounted this T c reduction to local structure distortions occurred due to Sr doping. On the other hand Zheng et.al [7] concluded by X-ray Absorption Fine Structure (XAFS) that local structure distortions are not responsible for reduction in T c and the identity of CuO 2 -Y-CuO 2 sandwich structure in Sr doped and un-doped samples is more important.…”

Effect of Sr-for-Ba isovalent substitution on the local structure, hole distribution and magnetic irreversibility of Cu(Ba,Sr)2YbCu2O6.95(2)

“…This is illustrated in Fig. 7 system, the very first NPD study using a sample with y = 0.5 (z not given) concluded full ordering of the oxygen vacancies [33], but later Licci et al [24] revealed partial shift of the charge-reservoir oxygen from the b-axis site to the a-axis site due to Sr substitution. Thermoelectric power measurement has proven to be a powerful tool to reveal the metallicity of (fully-oxygenated) CuO chains in Cu-1212 and related copper oxides [36 -38].…”

Practical superconductor development for electrical power applications Argonne National Laboratory - quarterly report for the period ending December 31, 2001

“…One possible cause for this complex behavior is that the YBCO phase decomposes during preparations at ambient pressure when the Sr concentration exceeds a value of x ≈ 1 in the system YBa 2-x Sr x Cu 3 O 7-x [4]. At the grain boundary interface, it is possible that the Sr concentration is high enough for phase decomposition to occur, perhaps influenced by the level and kinetics of oxygenation.…”