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Title: 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.
Authors:
; ; ;  [1]
  1. National Institute for Interdisciplinary Science and Technology (CSIR), Trivandrum 695019 (India)
Publication Date:
OSTI Identifier:
22278159
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARSENIC OXIDES; CALCIUM FLUORIDES; CALCIUM IONS; CRITICAL CURRENT; CRITICAL FIELD; CRITICAL TEMPERATURE; CURRENT DENSITY; DOPED MATERIALS; ELECTRONS; GRAIN SIZE; HOLES; IRON COMPOUNDS; NEODYMIUM COMPOUNDS; NEODYMIUM IONS; SUPERCONDUCTORS