Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 20, Issue 8, Pages 742-747Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/20/8/004
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The high temperature superconductor thin films Cu1-xTlxBa2Ca3Cu4O12-delta (Cu1-x Tl-x-1234) are post-annealed in a nitrogen atmosphere. The zero-resistivity critical temperature (T-c(R = 0)) of these thin films is increased from 92.3 to 104 K. The grain size is enhanced and their morphology is improved with the post-annealing. The enlargement of grain size is linked to fluctuation-induced conductivity (FIC) in the light of Aslamazov-Larkin (AL) theory. The FIC measurements have shown that the cross-over of three-dimensional (3D) to two-dimensional (2D) behaviour of fluctuations is shifted to higher temperature values with an increase of post-annealing temperature. These results have shown that the removal of oxygen and the increased grain size are the most likely sources of the increase in the cross-over temperature, T* to higher values.
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