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Flux pinning in melt processed REBaCuO
- Source :
- Physica C: Superconductivity. :371-374
- Publication Year :
- 1997
- Publisher :
- Elsevier BV, 1997.
-
Abstract
- REBaCuO (RE: rare earth element selected from Nd, Sm, Eu, Gd) superconductors exhibit high T c and J c values when they are melt processed in a reduced oxygen atmosphere (oxygen-controlled-melt-growth: OCMG process). Large J c values in these systems can be attributed to finely dispersed RE rich 123 clusters, which can act as field-induced pinning centers, and thus leading to the second peak effect in M - H loops. In this paper, we first propose the mechanism how RE rich clusters are formed during melt processing. Second we show that flux pinning depends on oxygen annealing conditions, because the optimum oxygenation conditions are different depending on the range of NdBa substitution. We also report that the addition of ND422 is effective in raising J c , although the mechanism is rather complicated owing to the fact that ND422 also has a REBa solid solution toward Ba rich direction.
- Subjects :
- Superconductivity
Range (particle radiation)
Flux pinning
Materials science
Condensed matter physics
Rare-earth element
Energy Engineering and Power Technology
Condensed Matter Physics
Oxygen atmosphere
Raising (metalworking)
Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering
Oxygen annealing
Solid solution
Subjects
Details
- ISSN :
- 09214534
- Database :
- OpenAIRE
- Journal :
- Physica C: Superconductivity
- Accession number :
- edsair.doi...........69c4b603c131bb58dea292554f2b7b73