Intra- and inter-grain currents in coated conductors with arbitrary grain boundary properties from magnetic measurements
- ORNL
A generalized methodology is described for determining both the intragranular and through-grain-boundary critical current densities in practical coated conductors from contact-free magnetic hysteresis measurements. The model incorporates the vector nature of current density J within the superconducting grains and current conservation with respect to the grain boundaries. Using physically observed values for the grain aspect ratio as input, the analysis yields the low-field intragranular critical current density J{sub c}{sup G} from a single field-dependent measurement of the global J{sub c} and provides a consistent description that spans the entire range from the weak-link (J{sub c}/J{sub c}{sup G}) to the single-grain (J{sub c}/J{sub c}{sup G} {yields} 1) limit. Results are given for ex situ processed RBCO coatings on RABiTS.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- OE USDOE - Office of Electric Transmission and Distribution
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1009920
- Journal Information:
- Superconductor Science & Technology, Journal Name: Superconductor Science & Technology Journal Issue: 6 Vol. 24; ISSN 0953-2048
- Country of Publication:
- United States
- Language:
- English
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