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Superconducting properties of Cu1-xTlxBa2Ca3-yMgy Cu4O12-delta (Cu1-xTlx Mgy-1234) material have been studied in the composition range y=0,1.5,2.25. The zero resistivity critical temperature [Tc (R=0)] was found to increase with the increased concentration of Mg in the unit cell; for y=1.5 [Tc(R=0)]=131 K was achieved which is hitherto highest in Cu1-xTlx-based superconductors. The X-ray diffraction...
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