Abstract
Superconductor samples of nominal compositionHg1-xTlxBa2Ca3Cu4O10+δ (0.3⩽x⩽1.0) areprepared at ambient pressure using a closed quartz tube at 850 °C.X-ray powder diffraction for the prepared samples is carried out and theresults show that the structure of this system is a tetragonal. The latticeparameters a and c are calculated, and the data indicate that a is notaffected by the substitution of Tl3+ into Hg2+, whereas cdecreases as the Tl content increases. The superconductivity is investigatedusing the electrical resistance and ac magnetic susceptibility measurements.All the samples have a superconducting behaviour except when x = 0.3. Toimprove the superconducting properties of this system, the cooling rate forthe sample with x = 0.7 is studied; also the replacement of Ca by Sr for bothx = 0.3 and x = 0.5 have been investigated. The excess conductivity forx = 0.3 shows that the dimensionality is changed from two-dimensional in thehigh-temperature region to three-dimensional in the mean field region.
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