Homogeneous distribution of carriers in the conducting planes by Zn substitution at Cu sites in Cu0.5Tl0.5Ba2Ca3Cu4O12-d superconductors

Анотація

The effect of suppression of antiferromagnetic order and charge stripes formation mechanism, by Zn3d¹⁰ (S = 0) substitution at Cu3d⁹ (S = 1/2) sites in CuO₂ planes of Cu_0.5Tl_0.5Ba₂Ca₃Cu₄O_12–δ, on superconductivity parameters is demonstrated. If antiferromagnetism and charge stripes have some role in bringing about superconductivity at a particular temperature, the doping of nonmagnetic Zn impurity would destroy it and hence the superconductivity. However we have observed enhanced superconducting properties with the increase of Zn doping in Cu_0.5Tl_0.5Ba₂Ca₃Cu₄O_12–δ superconductor. The decreased c-axis length with the increase of Zn doping improves interlayer coupling and hence the three-dimensional conductivity in the unit cell. The role of charge carriers in CuO₂ planes of Cu_0.5Tl_0.5Ba₂Ca₃Cu_4–yZn_yO_12–δ in bringing about superconductivity has also been explained.