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Article Dans Une Revue IEEE Transactions on Applied Superconductivity Année : 2019

Current flow and flux pinning properties of YBCO foam struts

Résumé

The current flow and the flux pinning properties on struts of superconducting YBa2Cu3Ox (YBCO) foams are analyzed in detail in the temperature range 60 K ≤ T ≤ Tc. For this purpose, magnetization loops were measured on foam struts taken from various positions of a 5 × 2 × 2 cm 3 large foam sample prepared at RWTH Aachen. From these data, the critical current densities, jc, and the flux pinning forces, Fp = jc × B, were calculated and pinning force scaling diagrams Fp/Fp,max vs. h = Ha/Hirr were established. The scaling in the temperature range 60 K < T < 90 K was found to be well developed for all samples with peak positions, h0, above 0.4, which is an indication of δTc-pinning. The shape of the pinning functions is found to be completely different from all other high-Tc materials and varies only slightly with position. This specific dome-shape cannot be described by an addition of several pinning functions, and the parameters p and q do not fit to the description of Dew-Hughes. Therefore, we employ Kramer plots to obtain more information on the flux pinning mechanism.
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Dates et versions

hal-01987980 , version 1 (29-01-2019)

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Michael Rudolf Koblischka, Anjela Koblischka-Veneva, Kévin Berger, Quentin Nouailhetas, Bruno Douine, et al.. Current flow and flux pinning properties of YBCO foam struts. IEEE Transactions on Applied Superconductivity, 2019, 29 (5), pp.1-5. ⟨10.1109/TASC.2019.2894712⟩. ⟨hal-01987980⟩
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