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Microstructure of SrTiO3 buffer layers and itseffects on superconducting properties ofYBa2Cu3O7-δ coated conductors

Published online by Cambridge University Press:  03 March 2011

H. Wang ,
S.R. Foltyn ,
P.N. Arendt ,
Q.X. Jia ,
J.L. MacManus-Driscoll ,
L. Stan ,
Y. Li ,
X. Zhang  and
P.C. Dowden
H. Wang
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
S.R. Foltyn
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
P.N. Arendt
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Q.X. Jia
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J.L. MacManus-Driscoll
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
L. Stan
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Y. Li
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
X. Zhang
Affiliation:
Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
P.C. Dowden
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

A thin layer of SrTiO3 (STO) has successfully been used as a buffer layer to grow high-quality superconducting YBa2Cu3O7-δ(YBCO) thick films on polycrystalline metal substrates with a biaxially oriented MgO template produced by ion-beam-assisted deposition. Using this architecture, 1.5-μm-thick YBCO films with an in-plane mosaic spread in the range of 2.5° to 3.5° in full width at half-maximum and critical current density over 2 × 10 6A/cm2 in self-field at 75 K have routinely been achieved. It is interesting to note that the pulsed laser deposition growth conditions of SrTiO3 buffer layers, such as growth temperature and oxygen pressure, have strong effects on the superconducting properties of YBCO. Detailed studies using transmission electron microscopy, scanning electron microscopy, and atomic force microscopy were used to explore the microstructures of STO deposited at different conditions and to understand further their effects on the growth and properties of YBCO films.

Keywords

SuperconductorLaser ablationThin film
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 6 , June 2004 , pp. 1869 - 1875
Copyright
Copyright © Materials Research Society 2004

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References

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