Abstract
We reported that maximum TC values for Tl system superconductors TlBa2Ca2Cu3Oy (Tl-1223) can be controlled by slightly varying the starting composition. From the DC magnetization measurements, we estimated intragrain critical current densities (JC) and irreversibility fields (Birr) of Tl-1223 samples with different maximum TC values (∼130 K and 120 K). These results were compared with those values for previously reported optimally-doped Hg-1223. It is found that, in the Birr -T curve at temperatures above 77K, Birr values of the Tl-1223 samples with TC∼130K shows slightly higher values than that of the Tl-1223 samples with low TC and Hg-1223 samples.
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