AC-susceptibility measurements of Cu1−xTlxBa2Ca3Cu4O12−δ superconductor thin films with different thallium content
作者： Nawazish A. Khan , M. Mumtaz , A.A. Khurram , P. Kameli
DOI: 10.1016/J.PHYSC.2007.12.005
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摘要: Abstract We have studied the superconductivity of Cu 1− x Tl Ba 2 Ca 3 4 O 12− δ ( = 0.8 and 0.5) thin films by AC-susceptibility measurements under various external AC magnetic field strengths. It is observed from these that χ ″ peak which associated with losses in superconductor samples representing intergranular coupling pinning strength shifted to lower temperature after application fields. = 0.5 applying very small (i.e. H ac up 50 A/m) whereas, thallium rich = 0.8) only affected higher fields 800 A/m. These results shown content enhanced granular connectivity stronger flux as compared smaller content.
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