Reel-to-reel continuous deposition of CexZr1-xO2single buffer layer for YBCO coated conductors

Y 2 O 3 and MgO-based buffer layer architectures on non-magnetic cube textured Ni-V substrates were studied for YBa 2 Cu 3 O 7-δ (YBCO) coated conductors fabrication using both pulsed laser deposition and electron beam evaporation. The Y 2 O 3 films exhibited a biaxial texture with φ and ω-scans full width at half maximum (FWHM) of about 11° and 7° and a smooth and continuous surface. YBCO thick films deposited on CeO 2/ Y 2 O 3/ Ni-V and CeO 2/ Y 2 O 3/ NiO/Ni-V architectures were mainly c-axis oriented showing a T C(R=0) above 85 K. MgO films were grown by electron beam evaporation both directly on metallic substrates and with a Pd intermediate layer. The MgO films grown on Ni-V substrates show a good texture and good surface morphological properties. The MgO deposition on Pd buffered Ni-V substrate leads to films with better structural properties with respect to MgO deposition on bare Ni-V substrate, showing φ and ω-scans FWHM up to 8° and 5°, respectively. In spite of the interdiffusion between Pd buffer layer and Ni-V substrate, the MgO films preserve their structural and morphological properties when annealed at typical YBCO deposition temperature.

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Single Buffer Layer Technology for YBCO Coated Conductors

MRS Proceedings ◽

10.1557/proc-689-e9.4 ◽

2001 ◽

Vol 689 ◽

Cited By ~ 1

Author(s):

M. Parans Paranthaman ◽

T. Aytug ◽

H. Y. Zhai ◽

S. Sathyamurthy ◽

H. M. Christen ◽

...

Keyword(s):

Buffer Layer ◽

High Current Density ◽

Rf Magnetron Sputtering ◽

Coated Conductors ◽

High Current ◽

Ybco Films ◽

X Ray ◽

Diffusion Barrier Layer ◽

Good Template ◽

Ybco Coated Conductors

ABSTRACTIn an effort to develop alternative single buffer layer technology for YBa2Cu3O7-δ (YBCO) coated conductors, we have investigated LaMnO3 (LMO) as a potential buffer layer. High-quality LMO films were grown directly on biaxially textured Ni and Ni-W (3%) substrates using rf magnetron sputtering. YBCO films were then grown on LMO buffers using pulsed laser deposition. Detailed X-ray studies have shown that both YBCO and LMO layers were grown with a single epitaxial orientation. Rutherford backscattering spectroscopy (RBS) analyses have indicated the ratio of La to Mn ratio is 1:1. SEM micrographs indicated that 3000-Å-thick LMO films on biaxially textured Ni (100) substrates were dense, continuous and crack-free. A high Jc of over 1 MA/cm2 at 77 K and self-field was obtained on YBCO films grown on LMO-buffered Ni or Ni-W substrates. We have identified LaMnO3 as a good diffusion barrier layer for Ni and it also provides a good template for growing high current density YBCO films.

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Engineered Microstructures and Transport Properties in YBCO Coated Conductors

MRS Proceedings ◽

10.1557/proc-689-e9.6 ◽

2001 ◽

Vol 689 ◽

Cited By ~ 2

Author(s):

T. G. Holesinger ◽

B. J. Gibbons ◽

J. Y. Coulter ◽

S. R. Foltyn ◽

J. R. Groves ◽

...

Keyword(s):

Transport Properties ◽

Buffer Layer ◽

Critical Current ◽

Film Structure ◽

Coated Conductors ◽

Superconducting Film ◽

Coated Conductor ◽

Layer Material ◽

Current Densities ◽

Ybco Coated Conductors

ABSTRACTEach process used to deposit or make the bi-axially textured template, buffer layer(s), and the superconductor in a coated conductor creates interfaces along which defects or interfacial reactions may result. These defects can be additive and propagate through the entire film structure to affect the growth and properties of the superconducting film. Defects within the films and their corresponding transport properties have been correlated with the differences in the thickness of the underlying buffer layer material. This knowledge can be used to control and engineer the structure of the coated conductor to maximize critical current densities.

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