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Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires
Author(s) -
Holesinger T. G.,
Civale L.,
Maiorov B.,
Feldmann D. M.,
Coulter J. Y.,
Miller D. J.,
Maroni V. A.,
Chen Z.,
Larbalestier D. C.,
Feenstra R.,
Li X.,
Huang Y.,
Kodenkandath T.,
Zhang W.,
Rupich M. W.,
Malozemoff A. P.
Publication year - 2008
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200700919
Subject(s) - materials science , microstructure , superconductivity , nanoscopic scale , electrical conductor , grain boundary , conductor , crystallite , context (archaeology) , flux pinning , critical current , high temperature superconductivity , grain size , nanotechnology , superconducting wire , engineering physics , composite material , condensed matter physics , metallurgy , paleontology , physics , engineering , biology
Abstract High critical current densities ( J c ) in thick films of the Y 1 Ba 2 Cu 3 O 7–δ (YBCO, T c ≈ 92 K) superconductor directly depend upon the types of nanoscale defects and their densities within the films. A major challenge for developing a viable wire technology is to introduce nanoscale defect structures into the YBCO grains of the thick film suitable for flux pinning and the tailoring of the superconducting properties to specific, application‐dependent, temperature and magnetic field conditions. Concurrently, the YBCO film needs to be integrated into a macroscopically defect‐free conductor in which the grain‐to‐grain connectivity maintains levels of inter‐grain J c that are comparable to the intra‐grain J c . That is, high critical current ( I c ) YBCO coated conductors must contain engineered inhomogeneities on the nanoscale, while being homogeneous on the macroscale. An analysis is presented of the advances in high‐performance YBCO coated‐conductors using chemical solution deposition (CSD) based on metal trifluoroacetates and the subsequent processing to nano‐engineer the microstructure for tuneable superconducting wires. Multi‐scale structural, chemical, and electrical investigations of the CSD film processes, thick film development, key microstructural features, and wire properties are presented. Prospects for further development of much higher I c wires for large‐scale, commercial application are discussed within the context of these recent advances.