Improvement of superconductivity with the reduced anti-ferromagnetism in Zn-doped CuTl-1223 superconductors

Abstract

The effect of suppression of anti-ferromagnetic order with the substitution of Zn 3d 10 (S = 0) at Cu 3d 9 (S = 1/2) sites in CuO 2 planes of Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3 O 10−δ (CuTl-1223) superconductors has been discussed. It has been demonstrated from the comparison of our results with the previously published data that Zn doping suppresses anti-ferromagnetism and enhances superconductivity. The decreased c-axis length with the increased Zn doping has been found to improve the interplane coupling and hence enhance the three-dimensional (3D) conductivity in the unit cell. The role of charge carriers in CuO 2 planes of Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3− y Zn y O 10−δ in bringing about superconductivity has also been explained.

Synthesis and superconductivity of (Ag) x /CuTl-1223 composites

“…The absorption bands in the range from 400 to 540 cm À 1 are associated with the apical oxygen atoms and in the range around from 541 to 600 cm À 1 are associated with CuO 2 planar oxygen atoms [32,33]. The absorption bands in the range from 670 to 700 cm À 1 are associated with O δ atoms in the charge reservoir layer [34][35][36][37][38]. The apical oxygen modes of type Tl-OA-Cu(2) and Cu(1)-O A -Cu(2) are observed around 430 cm À 1 and 460-499 cm À 1 and CuO 2 planner oxygen mode is around 536 cm À 1 in the pure Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3 O 10À δ samples.…”