Microstructure of YBa2Cu3O7-y films on CeO2-buffered Al2O3

K. Develos; H. Yamasaki; A. Sawa; Y. Nakagawa; S. Ohshima; M. Mukaida

doi:10.1016/S0921-4534(01)00517-2

Microstructure of YBa₂Cu₃O_7-y films on CeO₂-buffered Al₂O₃

K. Develos, H. Yamasaki, A. Sawa, Y. Nakagawa, S. Ohshima, M. Mukaida

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

We investigated the microstructure of epitaxial c-axis oriented YBCO films laser-deposited onto CeO₂-buffered Al₂O₃ substrates. Using transmission electron microscopy (TEM), scanning electron microscopy and Auger electron spectroscopy, we have identified the majority of outgrowths which are spherical or polygonal in shape, with sizes ranging from 0.1 to 0.5 μm as having the same composition as that of the YBCO matrix. Another type of outgrowth with irregular shapes and sizes ranging from 0.5 to 1.0 μm was also found to have a composition of BaCuO₂ or CuO. Combined scanning transmission electron microscopy and selective area electron diffraction measurements identified the former as slightly misaligned YBCO. Although there is a large number of surface outgrowths in the YBCO film, the critical current density J_c as calculated from hysteretic magnetization measurements is relatively high, where J_c ∼ 1.7 × 10⁶ A cm^-2 at 77 K.

Original language	English
Pages (from-to)	1353-1357
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	357-360
DOIs	https://doi.org/10.1016/S0921-4534(01)00517-2
Publication status	Published - Sept 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(01)00517-2

Cite this

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title = "Microstructure of YBa2Cu3O7-y films on CeO2-buffered Al2O3",

abstract = "We investigated the microstructure of epitaxial c-axis oriented YBCO films laser-deposited onto CeO2-buffered Al2O3 substrates. Using transmission electron microscopy (TEM), scanning electron microscopy and Auger electron spectroscopy, we have identified the majority of outgrowths which are spherical or polygonal in shape, with sizes ranging from 0.1 to 0.5 μm as having the same composition as that of the YBCO matrix. Another type of outgrowth with irregular shapes and sizes ranging from 0.5 to 1.0 μm was also found to have a composition of BaCuO2 or CuO. Combined scanning transmission electron microscopy and selective area electron diffraction measurements identified the former as slightly misaligned YBCO. Although there is a large number of surface outgrowths in the YBCO film, the critical current density Jc as calculated from hysteretic magnetization measurements is relatively high, where Jc ∼ 1.7 × 106 A cm-2 at 77 K.",

author = "K. Develos and H. Yamasaki and A. Sawa and Y. Nakagawa and S. Ohshima and M. Mukaida",

year = "2001",

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AU - Develos, K.

AU - Yamasaki, H.

AU - Sawa, A.

AU - Nakagawa, Y.

AU - Ohshima, S.

AU - Mukaida, M.

PY - 2001/9

Y1 - 2001/9

N2 - We investigated the microstructure of epitaxial c-axis oriented YBCO films laser-deposited onto CeO2-buffered Al2O3 substrates. Using transmission electron microscopy (TEM), scanning electron microscopy and Auger electron spectroscopy, we have identified the majority of outgrowths which are spherical or polygonal in shape, with sizes ranging from 0.1 to 0.5 μm as having the same composition as that of the YBCO matrix. Another type of outgrowth with irregular shapes and sizes ranging from 0.5 to 1.0 μm was also found to have a composition of BaCuO2 or CuO. Combined scanning transmission electron microscopy and selective area electron diffraction measurements identified the former as slightly misaligned YBCO. Although there is a large number of surface outgrowths in the YBCO film, the critical current density Jc as calculated from hysteretic magnetization measurements is relatively high, where Jc ∼ 1.7 × 106 A cm-2 at 77 K.

AB - We investigated the microstructure of epitaxial c-axis oriented YBCO films laser-deposited onto CeO2-buffered Al2O3 substrates. Using transmission electron microscopy (TEM), scanning electron microscopy and Auger electron spectroscopy, we have identified the majority of outgrowths which are spherical or polygonal in shape, with sizes ranging from 0.1 to 0.5 μm as having the same composition as that of the YBCO matrix. Another type of outgrowth with irregular shapes and sizes ranging from 0.5 to 1.0 μm was also found to have a composition of BaCuO2 or CuO. Combined scanning transmission electron microscopy and selective area electron diffraction measurements identified the former as slightly misaligned YBCO. Although there is a large number of surface outgrowths in the YBCO film, the critical current density Jc as calculated from hysteretic magnetization measurements is relatively high, where Jc ∼ 1.7 × 106 A cm-2 at 77 K.

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ER -

Microstructure of YBa₂Cu₃O_7-y films on CeO₂-buffered Al₂O₃

Abstract

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