Author:
Polichetti M.,Galluzzi A.,Buchkov K.,Tomov V.,Nazarova E.,Leo A.,Grimaldi G.,Pace S.
Abstract
AbstractThe correlation in type-II superconductors between the creep rate S and the Second Magnetization Peak (SMP) phenomenon which produces an increase in Jc, as a function of the field (H), has been investigated at different temperatures by starting from the minimum in S(H) and the onset of the SMP phenomenon detected on a FeSe0.5Te0.5 sample. Then the analysis has been extended by considering the entire S(H) curves and comparing our results with those of many other superconducting materials reported in literature. In this way, we find evidence that the flux dynamic mechanisms behind the appearance of the SMP phenomenon in Jc(H) are activated at fields well below those where the critical current starts effectively to increase. Moreover, the found universal relation between the minimum in the S(H) and the SMP phenomenon in Jc(H) shows that both can be attributed to a sequential crossover between a less effective pinning (losing its effectiveness at low fields) to a more effective pinning (still acting at high fields), regardless of the type-II superconductor taken into consideration.
Publisher
Springer Science and Business Media LLC
Reference79 articles.
1. Yeshurun, Y., Malozemoff, A. P. & Shaulov, A. Magnetic relaxation in high-temperature superconductors. Rev. Mod. Phys. 68, 911–949 (1996).
2. Anderson, P. W. Theory of Flux Creep in Hard Superconductors. Phys. Rev. Lett. 9, 309–311 (1962).
3. Anderson, P. W. & Kim, Y. B. Hard superconductivity: Theory of the motion of abrikosov flux lines. Rev. Mod. Phys. 36, 39–43 (1964).
4. Blatter, G., Feigel’Man, M. V., Geshkenbein, V. B., Larkin, A. I. & Vinokur, V. M. Vortices in high-temperature superconductors. Rev. Mod. Phys. 66, 1125–1388 (1994).
5. Eley, S. et al. Decoupling and tuning competing effects of different types of defects on flux creep in irradiated YBa2Cu3O7-δcoated conductors. Supercond. Sci. Technol. 30, 1–22 (2017).
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