Micro structural homogeneity and electromagnetic connectivity of YBa2Cu3O7-δ grown on rolling-assisted biaxially textured coated conductor substrates

Chau Yun Yang; A. Pashitski; A. Polyanskii; D. C. Larbalestier; S. E. Babcock; A. Goyal; F. A. List; C. Park; M. Paranthaman; D. P. Norton; D. F. Lee; D. M. Kroeger B

doi:10.1016/S0921-4534(99)00581-X

Micro structural homogeneity and electromagnetic connectivity of YBa₂Cu₃O_7-δ grown on rolling-assisted biaxially textured coated conductor substrates

Chau Yun Yang, A. Pashitski, A. Polyanskii, D. C. Larbalestier, S. E. Babcock, A. Goyal, F. A. List, C. Park, M. Paranthaman, D. P. Norton, D. F. Lee, D. M. Kroeger B

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Abstract

The electromagnetic connectivity and microstructure of three YBa₂Cu₃O_7-δ (YBCO) films grown on biaxially textured substrates were investigated by magneto optic (MO) imaging and scanning electron microscopy (SEM). The films were deposited by pulsed laser deposition (PLD) on yttria-stabilized zirconia (YSZ) and CeO₂-buffered, biaxially textured Ni tapes. The transport critical current density (J_c) values of the films were 0.3, 0.6 and 0.7 MA/cm² (77 K, 0 T). MO imaging revealed clearly granular electromagnetic behavior in the lowest J_c and one of the higher J_c samples, but considerably better connectivity in the sample with a J_c value of 0.6 MA/cm². High resolution SEM showed a dense and rather featureless microstructure in the YBCO of the most highly electromagnetically connected sample, whereas pores and/or second phase particles cluttered the YBCO layers of the granular samples. Thus, the granular behavior in these samples appears to be caused by pores and second phase particles that locally obstruct the superconducting current in the YBCO layer. Control of these types of defects clearly is important for raising the J_c value.

Original language	English
Pages (from-to)	114-120
Number of pages	7
Journal	Physica C: Superconductivity and its Applications
Volume	329
Issue number	2
DOIs	https://doi.org/10.1016/S0921-4534(99)00581-X
State	Published - 2000

Funding

The work performed at the University of Wisconsin is supported by ORNL, AFOSR, and the NSF MRSEC. The electron microscopy facilities used for this research are maintained by the UW Materials Science Center with partial support from the NSF MRSEC. The research performed at the ORNL was sponsored by the Division of Materials Sciences, the Office of Basic Energy Sciences, the Office of Energy Efficiency and Renewable Energy, and the Office of Utility Technologies-Superconductivity Program. ORNL is managed by Lockheed Martin Energy Research for the US Department of Energy under contract #DE-AC05-960R22464.

Funders	Funder number
Division of Materials Sciences
Office of Utility Technologies-Superconductivity Program
UW Materials Science Center
U.S. Department of Energy	-AC05-960R22464
Air Force Office of Scientific Research
Office of Energy Efficiency and Renewable Energy
Basic Energy Sciences
Oak Ridge National Laboratory
Materials Research Science and Engineering Center, Harvard University

Keywords

Coated conductors
Magneto optic imaging
RABiTS™
YBCO

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10.1016/S0921-4534(99)00581-X

Cite this

Yang, C. Y., Pashitski, A., Polyanskii, A., Larbalestier, D. C., Babcock, S. E., Goyal, A., List, F. A., Park, C., Paranthaman, M., Norton, D. P., Lee, D. F., & Kroeger B, D. M. (2000). Micro structural homogeneity and electromagnetic connectivity of YBa₂Cu₃O_7-δ grown on rolling-assisted biaxially textured coated conductor substrates. Physica C: Superconductivity and its Applications, 329(2), 114-120. https://doi.org/10.1016/S0921-4534(99)00581-X

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title = "Micro structural homogeneity and electromagnetic connectivity of YBa2Cu3O7-δ grown on rolling-assisted biaxially textured coated conductor substrates",

abstract = "The electromagnetic connectivity and microstructure of three YBa2Cu3O7-δ (YBCO) films grown on biaxially textured substrates were investigated by magneto optic (MO) imaging and scanning electron microscopy (SEM). The films were deposited by pulsed laser deposition (PLD) on yttria-stabilized zirconia (YSZ) and CeO2-buffered, biaxially textured Ni tapes. The transport critical current density (Jc) values of the films were 0.3, 0.6 and 0.7 MA/cm2 (77 K, 0 T). MO imaging revealed clearly granular electromagnetic behavior in the lowest Jc and one of the higher Jc samples, but considerably better connectivity in the sample with a Jc value of 0.6 MA/cm2. High resolution SEM showed a dense and rather featureless microstructure in the YBCO of the most highly electromagnetically connected sample, whereas pores and/or second phase particles cluttered the YBCO layers of the granular samples. Thus, the granular behavior in these samples appears to be caused by pores and second phase particles that locally obstruct the superconducting current in the YBCO layer. Control of these types of defects clearly is important for raising the Jc value.",

keywords = "Coated conductors, Magneto optic imaging, RABiTS{\texttrademark}, YBCO",

author = "Yang, {Chau Yun} and A. Pashitski and A. Polyanskii and Larbalestier, {D. C.} and Babcock, {S. E.} and A. Goyal and List, {F. A.} and C. Park and M. Paranthaman and Norton, {D. P.} and Lee, {D. F.} and {Kroeger B}, {D. M.}",

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doi = "10.1016/S0921-4534(99)00581-X",

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Yang, CY, Pashitski, A, Polyanskii, A, Larbalestier, DC, Babcock, SE, Goyal, A, List, FA, Park, C, Paranthaman, M, Norton, DP, Lee, DF & Kroeger B, DM 2000, 'Micro structural homogeneity and electromagnetic connectivity of YBa₂Cu₃O_7-δ grown on rolling-assisted biaxially textured coated conductor substrates', Physica C: Superconductivity and its Applications, vol. 329, no. 2, pp. 114-120. https://doi.org/10.1016/S0921-4534(99)00581-X

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T1 - Micro structural homogeneity and electromagnetic connectivity of YBa2Cu3O7-δ grown on rolling-assisted biaxially textured coated conductor substrates

AU - Yang, Chau Yun

AU - Pashitski, A.

AU - Polyanskii, A.

AU - Larbalestier, D. C.

AU - Babcock, S. E.

AU - Goyal, A.

AU - List, F. A.

AU - Park, C.

AU - Paranthaman, M.

AU - Norton, D. P.

AU - Lee, D. F.

AU - Kroeger B, D. M.

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N2 - The electromagnetic connectivity and microstructure of three YBa2Cu3O7-δ (YBCO) films grown on biaxially textured substrates were investigated by magneto optic (MO) imaging and scanning electron microscopy (SEM). The films were deposited by pulsed laser deposition (PLD) on yttria-stabilized zirconia (YSZ) and CeO2-buffered, biaxially textured Ni tapes. The transport critical current density (Jc) values of the films were 0.3, 0.6 and 0.7 MA/cm2 (77 K, 0 T). MO imaging revealed clearly granular electromagnetic behavior in the lowest Jc and one of the higher Jc samples, but considerably better connectivity in the sample with a Jc value of 0.6 MA/cm2. High resolution SEM showed a dense and rather featureless microstructure in the YBCO of the most highly electromagnetically connected sample, whereas pores and/or second phase particles cluttered the YBCO layers of the granular samples. Thus, the granular behavior in these samples appears to be caused by pores and second phase particles that locally obstruct the superconducting current in the YBCO layer. Control of these types of defects clearly is important for raising the Jc value.

AB - The electromagnetic connectivity and microstructure of three YBa2Cu3O7-δ (YBCO) films grown on biaxially textured substrates were investigated by magneto optic (MO) imaging and scanning electron microscopy (SEM). The films were deposited by pulsed laser deposition (PLD) on yttria-stabilized zirconia (YSZ) and CeO2-buffered, biaxially textured Ni tapes. The transport critical current density (Jc) values of the films were 0.3, 0.6 and 0.7 MA/cm2 (77 K, 0 T). MO imaging revealed clearly granular electromagnetic behavior in the lowest Jc and one of the higher Jc samples, but considerably better connectivity in the sample with a Jc value of 0.6 MA/cm2. High resolution SEM showed a dense and rather featureless microstructure in the YBCO of the most highly electromagnetically connected sample, whereas pores and/or second phase particles cluttered the YBCO layers of the granular samples. Thus, the granular behavior in these samples appears to be caused by pores and second phase particles that locally obstruct the superconducting current in the YBCO layer. Control of these types of defects clearly is important for raising the Jc value.

KW - Coated conductors

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