Microstructural refinement and enhanced transport properties in binary doped NdFeAsO superconductor
We report the synthesis of Nd{sub 1−x}Ca{sub x}FeAsO{sub 1−2x}F{sub 2x} superconductors using CaF{sub 2} as a binary dopant that provides both holes and electrons by simultaneous substitution of Ca{sup 2+} ions and F{sup −} ions at Nd{sup 3+} and O{sup 2−} sites, respectively. The sample with x = 0.2 exhibits a maximum critical temperature (T{sub C}) of 52.3 K and transport critical current density (J{sub C}) of 1240 A/cm{sup 2} at 12 K. An interesting feature observed for binary doped samples is the preferential alignment of (00l) planes and the refinement of microstructure both in terms of grain size and grain connectivity. NdFeAsO based superconductors are already known for their very high critical fields and field independent J{sub C}(H) performance. However, the development of the bulk superconductors with oriented large grains and good grain connectivity has not been reported so far and hence the present work will be definitely a step towards the progress in NdFeAsO based conductor development.
- OSTI ID:
- 22278159
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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