Abstract
In the present work, magnetoresistivity performance of polycrystalline Bi2Sr2Ca1−x K x Cu2 O 8+y superconductor with x=0.0,0.05,0.075, and 0.1 has been studied by change of flux pinning mechanism, using magnetoresistivity measurements. The samples were prepared using a polymer solution technique. The effects of K substitution for Ca on the irreversibility field, upper critical magnetic field, coherence length, and activation energies have been investigated. The magnetoresistivity of the samples has been measured under applied magnetic fields ranging from 0 to 9 T. Broadening of superconducting transition is observed under magnetic field, explained on the basis of thermally activated flux flow (TAFF) model. The upper critical magnetic field H C2(0) and the coherence length (ζ(0)) at T = 0 K were calculated using the resistivity data and from H C2(0) ,respectively. H C2(0) and ξ(0) values have been calculated as 62, 72, 75, and 53 T and 23, 21, 20, and 25 A for the 0.0, 0.05, 0.075, and 0.10 K doped samples, respectively. TAFF model has been studied in order to calculate the flux pinning energies. In particular, the flux pinning energies of Bi2Sr2Ca1−x K x Cu2 O 8+y where x = 0.075 are calculated as 0.0147 eV for 9 T and 0.29 eV for 0 T.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
