Abstract
The effects of structural modifications on superconducting properties are investigated for the bismuth 2201 and 2212 and thallium 2201 superconducting compounds. Substituting lead for bismuth causes an increase of the superconducting transition temperature and an additional long-period modulation. Long-range structural ordering induced by slow cooling leads to a higher superconducting volume for the samples. Different thermal treatments of the thallium 2201 compound result in either orthorhombic non-superconducting or tetragonal superconducting samples. The tetragonal symmetry is due to short-range ordering and microdomain formation. Thus, for this compound, short-range ordering seems to favor superconductivity.
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