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Origin of peak effect in the magnetization hysteresis loop of melt-processed REBa2Cu3Oy superconductors
V. N. Viswanath N., Rajasekharan T., Menon Latika, , K. Malik S., K. Dey G., D. Upadhyaya D.
Published in AIP Publishing
Volume: 71
Issue: 26
Pages: 3895 - 3897

Melt-processed Sm-123 samples with an excess Sm2BaCuOy (Sm-211) phase is studied by transmission electron microscope (TEM) and superconducting quantum interference device magnetometer, to explain the origin of the peak effect exhibited in the magnetization hysteresis loops of light RE-123 samples in intermediate fields at 77 K. TEM images of the sample showing peak effect reveal dilute concentrations of areas with ortho-II structure distributed on a nanometer scale within the twin regions of the sample. The ortho-II structure is an oxygen deficient 123 with a lower Tc

than the bulk of the material and will be a source of flux pinning by turning normal in high fields, thus contributing to the peak effect. With an increase in Sm-211 concentration, the peak effect disappears from the hysteresis loop, as does the ortho-II structure in the TEM images.

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JournalData powered by TypesetApplied Physics Letters
PublisherData powered by TypesetAIP Publishing
Open AccessNo