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Pinning Force Scaling Analysis of Polycrystalline MgB2

Abstract : Abstract Flux pinning force scaling $f=F_{p}/F_{p,\max \limits }$ f = F p / F p , max vs. h = H a / H irr was performed on a variety of pure MgB 2 samples, including a spark plasma sintered (SPS) one and a series of samples sintered at various reaction temperatures ranging between 775 and 950 ∘ C. The SPS sample exhibits a well-developed scaling at all temperatures, and also the sintered samples prepared at 950 ∘ C; however, the obtained peak positions of the pinning force scalings are distinctly different: The SPS sample reveals dominating pinning at grain boundaries, whereas the dominating pinning for the other one is point-pinning. All other samples studied reveal an apparent non-scaling of the pinning forces. The obtained pinning parameters are discussed in the framework of the Dew–Hughes’ pinning force scaling approach.
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Submitted on : Tuesday, June 29, 2021 - 12:09:46 PM
Last modification on : Sunday, June 26, 2022 - 3:10:31 AM

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M. Koblischka, A. Wiederhold, A. Koblischka-Veneva, C. Chang. Pinning Force Scaling Analysis of Polycrystalline MgB2. Journal of Superconductivity and Novel Magnetism, Springer Verlag, 2020, 33 (11), pp.3333-3339. ⟨10.1007/s10948-020-05456-8⟩. ⟨hal-03273570⟩



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