Preparation of YBCO films on CeO2-buffered MgO substrates by coating pyrolysis

Sohma, M.; Yamaguchi, Yuichi; Yamaguchi, Iwao; Tsukada, K.; Mizuta, Susumu; Manabe, Takaaki; Kumagai, Toru

doi:10.1016/s0921-4534(03)01020-7

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…In a national project of Japan, "Research and development of fundamental technologies for superconducting AC power equipment (Super-ACE)", one of its main targets is to develop a manufacturing technique of large-area HTS films that have a critical current density in excess of 1 . A chemical solution-based metal-organic deposition (MOD) is one of the most attractive techniques for preparation of large-area HTS films at low cost [2]. Since the epitaxial growth mechanism of YBCO in the chemical solution-related routes Manuscript as MOD is quite different from that of the layer-by-layer type growth in physical deposition processes such as sputtering (SP), pulsed laser deposition (PLD) and molecular beam epitaxy (MBE).…”

Section: Introductionmentioning

confidence: 99%

Preparation of<tex>$rm CeO_2$</tex>-Buffer Layers for Large-Area MOD-YBCO Films<tex>$(10times30 rm cm^2)$</tex>With High-<tex>$J_c$</tex>

Sohma

Yamaguchi

Tsukada

et al. 2005

IEEE Trans. Appl. Supercond.

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Epitaxial cerium oxide (CeO 2 ; thickness: 40 nm) buffer layers were deposited on large area (maximum size 10 30 cm 2 ) R-cut single-crystal sapphire ( Al 2 O 3 ) substrates by double electron-beam guns. Substrate heater-and-holder system was modified to maintain the substrate temperature uniform over the large area during deposition. Oxygen gas of a pressure 4 10 2 Pa was introduced to keep radio frequency plasma. When the substrate temperature was controlled in the range 640 -700 C, the CeO 2 buffer showed a complete (001) orientation and very smooth surfaces by x-ray diffraction analysis and atomic force microscopic observations, respectively, in the whole area of the large size substrates. These buffer layers without post-deposition annealing were quite suitable for preparing YBa 2 Cu 3 O 7 (YBCO) films by a metal-organic deposition (MOD) using a metal acetylacetonate-based solution. The average critical current density of the 210-nm-thick MOD-YBCO film was in excess of 2.6 MA cm 2 measured by an inductive method at K.Index Terms-CeO 2 buffer, high-temperature superconductors, MOD process, YBa 2 Cu 3 O 7 .

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Section: Introductionmentioning

confidence: 99%

Preparation of<tex>$rm CeO_2$</tex>-Buffer Layers for Large-Area MOD-YBCO Films<tex>$(10times30 rm cm^2)$</tex>With High-<tex>$J_c$</tex>

Sohma

Yamaguchi

Tsukada

et al. 2005

IEEE Trans. Appl. Supercond.

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“…A CeO 2 layer was deposited on the sapphire by vacuum evaporation with an electron beam gun. In contrast with the previous paper [12], in which the CeO 2 buffer layer was deposited on the substrates up to 5 cm diameter, a larger-size sample stage surrounded with a metal thermal shield was introduced into the vacuum chamber to meet the size requirement. For preparing a CeO 2 layer by vacuum evaporation, the deposition temperature is one of the most important factors.…”

Section: Methodsmentioning

confidence: 99%

Two-dimensional large-size Y Ba₂Cu₃O₇films (30 × 10 cm²) on CeO₂-buffered sapphire by a coating pyrolysis process

Manabe¹,

Sohma²,

Yamaguchi³

et al. 2004

Supercond. Sci. Technol.

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Large-size, two-dimensional Y Ba2Cu3O7 (YBCO) films were successfully prepared by a chemical solution-based coating pyrolysis (CP) process on 30 × 10 cm2 R-plane sapphire substrates with a vacuum-deposited CeO2 buffer layer. The CeO2 layer was very smooth and uniform with an average roughness (Ra) of 0.48 nm by atomic force microscopic observations and highly (001)-oriented by large-area x-ray diffraction θ–2θ scans. The c-axis-oriented YBCO films were prepared by a CP process using a fluorine-free, metal acetylacetonate-based coating solution. A 30 × 10 cm2-rectangular c-axis-oriented YBCO film annealed in a large-diameter tube furnace demonstrated high inductive-Jc values, for which the distribution was fairly uniform, with an average 1.0 MA cm−2 at 77 K.

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“…Although STO has a high dielectric constant, it is conjectured to have no effect in the high frequency range when the thickness of the STO film is less than several hundred nanometers. It is important to fabricate STO thin films as a buffer layer by MOD to make full use of the advantages of MOD mentioned above (even though buffer layers such as CeO 2 on a MgO substrate are often fabricated by sputtering and vacuum deposition 7,8) ) similar to fabricating HTS thin films by MOD. That is, both the STO buffer layer and HTS thin films are prepared by MOD (all-MOD).…”

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confidence: 99%

Optimization of SrTiO₃ Precursor Films on MgO Substrates Prepared by the Metal–Organic Decomposition Method

Uchiyama¹,

Shoji

Tachiki

et al. 2007

jjap

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The narrow window for the preparation conditions of SrTiO3 (STO) thin films used as a buffer layer for high-Tc superconducting films synthesized by the metal–organic decomposition (MOD) method is reported. The values of the full width at half maximum (FWHM) of STO 200 observed from the rocking curve in X-ray diffraction (XRD) analysis are markedly suppressed up to 1.8° in the optimum range of precursor temperature. The minimum value of the in-plane FWHM of STO 110 was 2.65°. Below the optimum precursor temperature range, it was found that STO precursor films contained carbonates as a residue of metal–organic materials by X-ray photoelectron spectroscopy (XPS). A random nucleation was observed in the STO precursor films by atomic force microscopy (AFM) above the optimum range of precursor temperature.

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Preparation of YBCO films on CeO2-buffered MgO substrates by coating pyrolysis

Cited by 9 publications

References 9 publications

Preparation of<tex>$rm CeO_2$</tex>-Buffer Layers for Large-Area MOD-YBCO Films<tex>$(10times30 rm cm^2)$</tex>With High-<tex>$J_c$</tex>

Preparation of<tex>$rm CeO_2$</tex>-Buffer Layers for Large-Area MOD-YBCO Films<tex>$(10times30 rm cm^2)$</tex>With High-<tex>$J_c$</tex>

Two-dimensional large-size Y Ba₂Cu₃O₇films (30 × 10 cm²) on CeO₂-buffered sapphire by a coating pyrolysis process

Optimization of SrTiO₃ Precursor Films on MgO Substrates Prepared by the Metal–Organic Decomposition Method

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Preparation of YBCO films on CeO2-buffered MgO substrates by coating pyrolysis

Cited by 9 publications

References 9 publications

Preparation of&lt;tex&gt;$rm CeO_2$&lt;/tex&gt;-Buffer Layers for Large-Area MOD-YBCO Films&lt;tex&gt;$(10times30 rm cm^2)$&lt;/tex&gt;With High-&lt;tex&gt;$J_c$&lt;/tex&gt;

Preparation of&lt;tex&gt;$rm CeO_2$&lt;/tex&gt;-Buffer Layers for Large-Area MOD-YBCO Films&lt;tex&gt;$(10times30 rm cm^2)$&lt;/tex&gt;With High-&lt;tex&gt;$J_c$&lt;/tex&gt;

Two-dimensional large-size Y Ba2Cu3O7films (30 × 10 cm2) on CeO2-buffered sapphire by a coating pyrolysis process

Optimization of SrTiO3 Precursor Films on MgO Substrates Prepared by the Metal–Organic Decomposition Method

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Preparation of<tex>$rm CeO_2$</tex>-Buffer Layers for Large-Area MOD-YBCO Films<tex>$(10times30 rm cm^2)$</tex>With High-<tex>$J_c$</tex>

Preparation of<tex>$rm CeO_2$</tex>-Buffer Layers for Large-Area MOD-YBCO Films<tex>$(10times30 rm cm^2)$</tex>With High-<tex>$J_c$</tex>

Two-dimensional large-size Y Ba₂Cu₃O₇films (30 × 10 cm²) on CeO₂-buffered sapphire by a coating pyrolysis process

Optimization of SrTiO₃ Precursor Films on MgO Substrates Prepared by the Metal–Organic Decomposition Method