NDLI: Modification and Conversion of E-Beam Co-Evaporated Precursors for Fabricating High Critical Current <formula formulatype=inline> <tex Notation=TeX>${rm YBa}_{2}{rm Cu}_{3}{rm O}

Content Provider	IEEE Xplore Digital Library
Author	Yifei Zhang Feenstra, R. Cantoni, C. Christen, D.K. Miller, D.J.
Copyright Year	2002
Abstract	Ex situ conversion of e-beam co-evaporated precursors was studied in an effort to fabricate high critical current YBCO films using the BaF₂ process. The precursors were deposited on CeO₂ buffered single crystal YSZ substrates. It was shown that an intermediate oxygenation annealing prior to the conversion modifies the precursor crystallinity and promotes c-axis epitaxial growth while randomly-oriented film formation is suppressed. With the modified precursors, a critical current density (J_c, 77 K & 0 T) of 2.1 MA/cm² measured by SQUID magnetometry was obtained in 1.8 mum thick YBCO films. The mechanism of the pre-annealing effect was investigated by characterization of the precursors, quenched films, and fully converted films using XRD, SEM, and TEM. Cross-sectional TEM was used to study the early nucleation of YBCO film at the precursor/substrate interface. The significant effect of the precursor modification indicated that, in addition to optimizing conversion processing parameters, modifying the precursor is an effective way to achieve the desired epitaxial film structure and to obtain higher critical currents, I_c.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3188
Ending Page	3191
Page Count	4
File Size	1792217
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image converters Critical current Yttrium barium copper oxide Crystallization Substrates Annealing Epitaxial growth Critical current density Density measurement Current measurement YBCO film epitaxial growth nucleation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Transport Properties of ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$ Thin Films Near the Critical State

Comparison of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// precursors made using TFA-MOD and BaF/sub 2/ ex-situ processes and their post-deposition processing under low pressure conditions

${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7}$ Coated Conductor Grown by Hybrid Liquid Phase Epitaxy

Effects of Proton Irradiation on the Microwave Surface Resistance of ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$ Films

YBCO Film With Sm Addition Using Low-Fluorine TFA-MOD Approach

Fabrication, Qualification and Test of High ${rm J}_{rm c}$ Roebel ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$ Coated Conductor Cable for HEP Magnets

Disorder Effects on the Intrinsic Nonlinear Current Density in ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$

Interfacial Defects and Flux-Pinning Effects in Nanostructured ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$ Thin Films

Correlation Between Flux Pinning Properties and Interfacial Defects in ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}/{rm CeO}_{2}$ Multilayer Thin Films

Modification and Conversion of E-Beam Co-Evaporated Precursors for Fabricating High Critical Current ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$ Films

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Modification and Conversion of E-Beam Co-Evaporated Precursors for Fabricating High Critical Current ${rm YBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$ Films