Epitaxial growth of Ce2Y2O7 buffer layers for YBa2Cu3O7−δ coated conductors using reel-to-reel DC reactive sputtering

Feng, Feng; Lu, Yuming; Ying, Liliang; Liu, Z.Y.; Cai, Chuanbing; Hühne, Ruben; Holzäpfel, B.

doi:10.1016/j.physc.2011.04.010

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…Figure 1 shows the surface morphologies of CeO 2 films on Ni-W tape substrate with various thicknesses of 80, 150, and 200 nm. It is revealed that the morphology of the CeO 2 films is strongly subject to the thickness, in agreement with the observation [22]. Crack-free, pinhole-free and compact CeO 2 buffer layers can be achieved as seen in figure 1 in cases of various thicknesses.…”

Section: Resultssupporting

confidence: 88%

“…Due to the expensive equipment and complex processes needed, extensive efforts have been made by different groups either to simplify the buffer architecture or to explore costeffective techniques such as chemical solution deposition. In our group, several oxides with a pyrochlore or perovskite structure such as La 2 Zr 2 O 7 , Ce 2 Y 2 O 7 or Gd 2 Zr 2 O 7 were investigated with respect to a single buffer layer [21,22]. However, we note that CeO 2 thin film may act as a single buffer as well, provided that the problem of its thickness induced cracks is overcome.…”

Section: Introductionmentioning

confidence: 99%

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Cost-effective electrodeposition of an oxide buffer for high-temperature superconductor coated conductors

Sang¹,

Lu²,

Zhang³

et al. 2014

Supercond. Sci. Technol.

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It is demonstrated that electrodeposition is a promising cost-effective technique to grow oxide buffer on metallic tapes. The resultant layer of CeO 2 shows the biaxial texture of FWHM = 5.5 • as well as a smooth surface of RMS = 2.0 nm, and YBa 2 Cu 3 O 7−δ coated conductor with such a buffer exhibits the critical current density of 1.85 MA cm −2 at 77 K. Of more interest is that the CeO 2 film thickness reaches a high value of more than 200 nm without any cracks, while it is very hard to achieve a thickness of more than 70 nm in the conventional vapor deposition methods employed.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Cost-effective electrodeposition of an oxide buffer for high-temperature superconductor coated conductors

Sang¹,

Lu²,

Zhang³

et al. 2014

Supercond. Sci. Technol.

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“…high biaxial texture, low surface roughness, as well as good barrier behavior) that should be balanced, it appears that fully meeting the requirements of buffer layers remains challenging. To date, many efforts focusing on enhancing the understanding of fundamental issues of the developed buffer layer materials produced by chemical solution methods [10,11], as well as exploration of potential buffer layer materials or novel buffer layer configurations with superior performance, are still ongoing [12].…”

Section: Introductionmentioning

confidence: 99%

Development of all chemical solution derived Ce_0.9La_0.1O_{2 −y}/Gd₂Zr₂O₇buffer layer stack for coated conductors: influence of the post-annealing process on surface crystallinity

Zhao¹,

Li²,

Khoryushin³

et al. 2011

Supercond. Sci. Technol.

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Preparation and characterization of a biaxially textured Gd 2 Zr 2 O 7 and Ce 0.9 La 0.1 O 2−y (CLO, cap)/Gd 2 Zr 2 O 7 (GZO, barrier) buffer layer stack by the metal-organic deposition route are reported. YBa 2 Cu 3 O 7−d (YBCO) superconductor films were deposited by the pulsed-laser deposition (PLD) technique to assess the efficiency of such a novel buffer layer stack. Biaxial texture quality and morphology of the buffer layers and the YBCO superconductor films were fully characterized. The surface crystallinity of the buffer layers is studied by the electron backscatter diffraction technique. It is revealed that post-annealing GZO films in 2% H 2 in Ar is an effective way to improve the surface crystallinity. As a result, a highly textured CLO film can grow directly on the GZO film at a lower crystallization temperature. The critical current density of a YBCO PLD film is higher than 1 MA cm −2 (@77 K, in self-field), demonstrating that the novel CLO/GZO stack is very promising for further development of low cost buffer layer architectures for coated conductors.

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“…The in-plane FWHMs for YBCO films on LZO and CYO/LZO buffered NiW tapes are 8.0°and 6.2°, respectively, revealing a remarkable improvement for YBCO in texture due to additional buffer CYO layer involved. This is attributed to the CYO with better biaxially texture, and thus being easier for YBCO epitaxial growth than on the LZO [16]. Figure 8 shows the transport T c measurements for both architecture YBCO/LZO/NiW and YBCO/CYO/LZO/NiW.…”

Section: Resultsmentioning

confidence: 99%

“…A Ce-Y alloy with an atomic number ratio of 1: 1 is used as sputtering target. More details on the CYO deposition can be found elsewhere [16].…”

Section: Methodsmentioning

confidence: 99%

Reel-to-Reel Deposition of Reactively Sputtered LaZrO Buffer Layers on Textured NiW Tapes for YBaCuO Coated Conductors

Feng

Yu-qi

Liu

et al. 2011

J Supercond Nov Magn

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A biaxially textured buffer layer of LaZrO (LZO) was continuously grown on Ni-5-at%W (NiW) tapes using a reel-to-reel DC reactive sputtering technique. X-ray diffraction measurements revealed that the LZO layer deposited at water vapor partial pressures of 2.5×10 −2 Pa and the temperature of 800°C are biaxially textured with the misorientation as low as 4.7°. AFM measurements show that the layer's surfaces are homogeneous and flat with the RMS value less than 5 nm. YBa 2 Cu 3 O 7−δ (YBCO) superconducting films grown on the single LZO buffer layer exhibited the critical temperature (T c ) of 89 K with a narrow transition width less than 2 K. For comparison, another Ce 2 Y 2 O 7 (CYO) layer grown using DC reactive sputtering was added on the top of the LZO layer. The architecture YBCO/CYO/LZO/NiW exhibited better texture and higher T c such as 90 K with T c of 1.5 K, demonstrating the availability of a novel simplified buffer layer stack of CYO/LZO for superconducting coated conductors.

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Epitaxial growth of Ce2Y2O7 buffer layers for YBa2Cu3O7−δ coated conductors using reel-to-reel DC reactive sputtering

Cited by 12 publications

References 20 publications

Cost-effective electrodeposition of an oxide buffer for high-temperature superconductor coated conductors

Cost-effective electrodeposition of an oxide buffer for high-temperature superconductor coated conductors

Development of all chemical solution derived Ce_0.9La_0.1O_{2 −y}/Gd₂Zr₂O₇buffer layer stack for coated conductors: influence of the post-annealing process on surface crystallinity

Reel-to-Reel Deposition of Reactively Sputtered LaZrO Buffer Layers on Textured NiW Tapes for YBaCuO Coated Conductors

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Epitaxial growth of Ce2Y2O7 buffer layers for YBa2Cu3O7−δ coated conductors using reel-to-reel DC reactive sputtering

Cited by 12 publications

References 20 publications

Cost-effective electrodeposition of an oxide buffer for high-temperature superconductor coated conductors

Cost-effective electrodeposition of an oxide buffer for high-temperature superconductor coated conductors

Development of all chemical solution derived Ce0.9La0.1O2 −y/Gd2Zr2O7buffer layer stack for coated conductors: influence of the post-annealing process on surface crystallinity

Reel-to-Reel Deposition of Reactively Sputtered LaZrO Buffer Layers on Textured NiW Tapes for YBaCuO Coated Conductors

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Development of all chemical solution derived Ce_0.9La_0.1O_{2 −y}/Gd₂Zr₂O₇buffer layer stack for coated conductors: influence of the post-annealing process on surface crystallinity