Statistical variations of the elementary flux-pinning force and their effect on the shape of the bulk-pinning-force curve of high-field superconductors
L. D. Cooley, G. Stejic, D. C. Larbalestier
DOI 10.1103/PhysRevB.46.2964 · Physical Review B
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Abstract
It is a common procedure to infer the flux-pinning mechanism from the shape of the bulk-pinning-force curve [Fp(b)]. In this paper, we investigate the effects of having a distribution of elementary pinning forces (fp) on Fp(b) within the framework of fluxon core pinning and full summation. It is seen that the shape of Fp(b) can be significantly changed when the pins are strong and their fp distribution broad, whereas traditional ideas accept that its shape remains constant. A shift of the peak of Fp(b) to lower field and an increase in the curvature of the high-field portion of Fp(b) is seen. We find confirmation of the model in optimized high-Jc Nb-Ti composites, which have a broad distribution of α-Ti precipitate thicknesses.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb-Ti Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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