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JMT 2011, Vol. 19 Issue (2) :105-109    DOI: 10.3969/j.issn.2095-087X.2011.02.005
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Enhancement of flux pinning in GdBa2Cu3O7-y bulks prepared by nanoparticle-powder-assisted method
C. H. CHENG1, Chang Chun HSIEH2, Chuan KE2, H. ZHANG3, C. C. SORRELL1*
1. Superconductivity Research Group, School of Materials Science and Engineering, University of New South Wales, Sydney, 2052 NSW, Australia;
2. Key Laboratory for Levitation Technology and Maglev Trains, Ministry of Education of China, Superconductivity and New Energy Center(SNEC), Southwest Jiaotong University, Chengdu 610031, China;
3. Department of Physics, Peking University, Beijing 100871, China

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Abstract High quality GdBa2Cu3O7-y(Gd123) textured bulks with Nd2BaCuO5(Nd211) nanoparticle precipitations have been fabricated by a nanoparticle-powders-assisted MTG(melt-textured-growth) technique.The high density nanoscale flux pinning sites were introduced into Gd123 by mixing Nd211 nanoparticle powders(about 20-50 nm) with Gd123 nano-precursors before the MTG process.Microstructural analyses reveal that a large number of Nd211 nanoparticles with a size around 50-150 nm were inserted in the Gd123 matrix,forming a kind of superconducting nanocomposites.The critical current density at 77 K is systematically increased and the flux pinning behavior is significantly improved.The scaling behavior of the flux pinning force shows a magnetic field dependent feature with a peak located at hp≈0.4.This may be the fingerprint of melt-textured 123 compounds,which cannot be interpreted by the simple superposition of different types of elementary pinning sources.
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Chang Chun HSIEH
Chuan KE
Keywordsflux pinning   GdBa2Cu3O7-y   nanoparticle-powder assisted processing   critical current density     
Received 2011-06-04;
Fund:supported in part by the National Natural Science Foundation of China(No. 50872116);the Fundamental Research Funds for the Central Universities of China(No. SWJTU09ZT24);the PCSIRT of the Ministry of Education of China(No.IRT0751);the Specialized Research Fund for the Doctoral Program of Higher Education of China(No. 200806130023)
Cite this article:   
C. H. CHENG, Chang Chun HSIEH, Chuan KE, H. ZHANG, C. C. SORRELL.Enhancement of flux pinning in GdBa2Cu3O7-y bulks prepared by nanoparticle-powder-assisted method[J]  JMT, 2011,V19(2): 105-109
http://jmt.swjtu.edu.cn/EN/10.3969/j.issn.2095-087X.2011.02.005      or     http://jmt.swjtu.edu.cn/EN/Y2011/V19/I2/105
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