Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1820415 | Physica C: Superconductivity and its Applications | 2008 | 4 Pages |
Abstract
We have studied the superconductivity of Cu1âxTlxBa2Ca3Cu4O12âδ (x = 0.8 and 0.5) thin films by AC-susceptibility measurements under various external AC magnetic field strengths. It is observed from these measurements that the Ïâ³ peak of AC-susceptibility measurements which is associated with AC losses in the superconductor samples representing intergranular coupling and pinning strength of the samples is shifted to lower temperature after the application of external magnetic fields. It is observed from these measurements that in the samples with x = 0.5 the Ïâ³ peak is shifted to lower temperature by applying very small AC field (i.e. Hac up to 50 A/m) whereas, the Ïâ³ peak of thallium rich (x = 0.8) samples is only affected by higher magnetic fields up to 800 A/m. These results have shown that Cu1âxTlxBa2Ca3Cu4O12âδ superconductor thin films with higher thallium content have enhanced granular connectivity and stronger flux pinning as compared to the samples with smaller thallium content.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Nawazish A. Khan, M. Mumtaz, A.A. Khurram, P. Kameli,