Abstract
The effect of antiferromagnetic order suppression and charge stripes formation by Zn3d10 (S=0) substitution at Cu3d9 (S=1∕2) sites in CuO2 planes of Cu0.5Tl0.5Ba2Ca3Cu4O12−δ on the superconductivity parameters is demonstrated. If antiferromagnetism and charge stripes have some role in bringing about superconductivity at a particular temperature, doping with nonmagnetic Zn impurity would destroy it and hence the superconductivity. However we have observed enhanced superconducting properties with increased Zn doping in Cu0.5Tl0.5Ba2Ca3Cu4O12−δ superconductor. The decreased c-axis length with increased Zn doping improves interlayer coupling and hence the three-dimensional conductivity in the unit cell. The role of charge carriers in CuO2 planes of Cu0.5Tl0.5Ba2Ca3Cu4−yZnyO12−δ in bringing about superconductivity has also been explained.
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