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Critical current anisotropy for second generation HTS wires
E.F. Talantsev,N.M. Strickland,P. Hoefakker,J.A. Xia,N.J. Long 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Angular anisotropies of critical currents with respect to an applied magnetic eld,Ic(B,h), were experimentally studied for two typesof second-generation high-temperature superconductor (HTS) tapes synthesized by metal-organic and E-beam deposition. We alsoexamine the angular dependence of the power-law exponent in the electric eld-current density relation. The angular dependence of theseparameters provides an insight into the nature of the ux-pinning mechanisms in these tapes.
Microstructure of metal-organic deposited YBa₂Cu₃O7-δ wires with Dy and Zr additions observed by TEM
J.A. Xia,N.J. Long,N.M. Strickland,P. Hoefakker,E.F. Talantsev 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
The improvement of critical current densities of superconducting wires is essential for commercial applications. Many approacheshave been demonstrated to enhance ux pinning of YBa₂Cu₃O7-δ (YBCO) second-generation (2G) superconducting wires and thereforedensity through ux pinning by nanoparticles in metal-organic deposited (MOD) YBCO lms with Dy or Zr additions. Transmissionelectron microscopy (TEM) observation revealed that large densities of nanoparticles can be formed in YBCO lms through alteringthe precursor stoichiometry and cation additions. Most of these nanoparticles are in the range of 10-50 nm, and are well dispersed, mak-ing them ideal for ux pinning in YBCO 2G wires. The eects on critical current of these nanoparticles acting as ux pinning centers areinvestigated.
Nanoparticle additions for enhanced flux pinning in YBCO HTS films
N.M. Strickland,N.J. Long,E.F. Talantsev,P. Hoefakker,J.A. Xia,M.W. Rupich,W. Zhang,X. Li,T. Kodenkandath,Y. Huang 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
We describe a method for forming a nanoparticle dispersion in YBa₂Cu₃O7 superconducting lms grown by metal-organic depositionon RABiTS substrates. Two separate precursor modications have been shown by transmission electron microscopy to give nanopar-ticles of (Y,Dy)₂O₃ and BaZrO₃ with size distributions of 10-50 nm and 10-25 nm, respectively and that are well dispersed in the lm.These particles are eective ux pinning centers and enhance the transport critical current by up to 100% at 77 K for a magnetic eld of 1.5 T applied perpendicular to the tape. The processing required to grow these lms is not greatly altered from that of unmodied YBCO and can be readily transferred to continuous processing of long-length wires.