Analysis of pinning in NdBa2Cu3O7−δ superconductors
M. R. Koblischka, A. J. J. van Dalen, T. Higuchi, S. I. Yoo, M. Murakami
DOI 10.1103/PhysRevB.58.2863 · Physical Review B
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Abstract
Current densities js and volume pinning forces Fp are obtained in a wide temperature (5<~T<~92K) and field range (0<~μ0Ha<~9T) on different NdBa2Cu3O7−δ samples. Above 60 K a good scaling of the volume pinning force Fp versus the reduced field h=Ha/Hirr can be established. The scaled pinning curves are compared to several theoretical predictions. Experimental evidence for strong pinning at extended superconducting defects (interaction volume Vpin∼ξ2d) is given. These defects are ascribed to spatial composition fluctuations found in light rare-earth superconductors, providing a scatter of the transition temperature Tc. Such a pinning mechanism is especially important for applications of high-Tc superconductors operating at T=77K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93.8 | Pressure not reported | onset |
| NdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93.8 | Pressure not reported | onset |
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