Pulsed Laser Deposition of Nd-Doped YBa2Cu3O7-x Films for Coated Conductor Applications

AbstractPulsed-laser ablation was used to deposit YBa2Cu3O7-x (YBCO) films on LaAlO3 and metallic substrates in an effort to understand and develop the processing of coated conductors with enhanced properties. Doping of YBCO films with Nd was utilized as an approach for increasing their flux pinning properties. Separate targets of Nd2O3 and YBCO were used instead of a pre-mixed Nd2O3-YBCO target. The critical current density (Jc) of the films was measured by whole body dc transport measurements and the transition temperature (Tc) by ac susceptibility. The composition vs. depth profiles of the films were obtained by Secondary Ion Mass Spectrometry. The critical current of a 5000 Å thick Nd-doped YBCO film on a LaAlO3 substrate was measured at 77 K and found to be 57 A (Jc = 1.1×106 A/cm2).

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Development of High Critical Current YBCO Coated Conductors By Photo-Assisted MOCVD

MRS Proceedings ◽

10.1557/proc-659-ii4.3 ◽

2000 ◽

Vol 659 ◽

Author(s):

Yimin Chen ◽

Xin Chen ◽

Zhongjia Tang ◽

PenChu Chou ◽

Xin Zhang ◽

...

Keyword(s):

Single Crystal ◽

Critical Current ◽

Crystal Orientation ◽

Coated Conductors ◽

Buffer Layers ◽

Ybco Films ◽

Metallic Substrates ◽

Oxide Substrates ◽

Nickel Substrates ◽

Ybco Coated Conductors

ABSTRACTYBa2Cu3O7 (YBCO) films have been deposited by photo-assisted MOCVD at rates of greater than 0.3μm/min on both single crystal oxide substrates and atomically textured metallic substrates. The YBCO films of thickness from 0.5μm to 3μm deposited on LaAlO3 substrates are shown to be highly atomically ordered with Jc> 1 × 106 A/cm2. CeO2 buffer layers have also been developed by photo-assisted MOCVD for the integration of YBCO with metallic substrates. The CeO2 layers were found to be crack-free when grown on nickel even above 1 micron thickness, and exhibited crystal orientation and in-plane alignment similar to that of the atomically textured Ni substrates. YBCO films grown on the thick CeO2 buffer layers on nickel substrates have shown promising results with Jc∼6 × 105 A/cm2.

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Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

MRS Proceedings ◽

10.1557/opl.2013.1139 ◽

2013 ◽

Vol 1579 ◽

Author(s):

Francesco Rizzo ◽

Antonella Mancini ◽

Angelo Vannozzi ◽

Andrea Augieri ◽

Achille Angrisani Armenio ◽

...

Keyword(s):

Single Crystal ◽

Ybco Film ◽

Pulsed Laser ◽

Temperature Stability ◽

Coated Conductors ◽

Buffer Layers ◽

High Quality ◽

Ybco Films ◽

Metallic Substrates ◽

Large Current

ABSTRACTThe study of high quality YBa2Cu3O7-x (YBCO) based superconducting films is a fundamental issue to be addressed when dealing with the realization of efficient coated conductors with large current carrying capacity. In this perspective the investigation of innovative buffer layers structures able to allow epitaxial YBCO film grow on metallic substrates and to prevent contamination and degradation issues holds a central role.In this work we thoroughly study the properties of YBCO films grown by means of pulsed lasers deposition on CeO2 template on both bare MgO single crystal and MgO-homoepitaxial/MgO single crystal substrates. Due to its high chemical and temperature stability the MgO reduces the oxygen diffusion effects. On the other hand, the CeO2 layer, pulsed laser deposited, prevents the YBCO film from metallic contamination and facilitates its epitaxial growth. Morphology and crystalline structure of buffer layers and superconductors film are investigated by using scanning electron microscopy (SEM), X-ray and electrons back-scattered diffraction techniques (XRD and EBSD).YBCO films show good critical temperature values (Tc > 87K) with sharp transitions. These encouraging results make our structures promising candidates in the realization of high quality YBCO based coated conductors.

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YBa2Cu3O7-y−coated conductors with high engineering current density

Journal of Materials Research ◽

10.1557/jmr.2000.0379 ◽

2000 ◽

Vol 15 (12) ◽

pp. 2647-2652 ◽

Cited By ~ 62

Author(s):

M. Paranthaman ◽

C. Park ◽

X. Cui ◽

A. Goyal ◽

D. F. Lee ◽

...

Keyword(s):

Pulsed Laser Deposition ◽

Critical Current ◽

Current Density ◽

Ybco Film ◽

Pulsed Laser ◽

Coated Conductors ◽

Laser Deposition ◽

Ex Situ ◽

Layer Sequence ◽

Ybco Coated Conductors

Short segments of YBa2Cu3O7-y (YBCO) coated conductors were fabricated on rolling-assisted biaxially textured substrates (RABiTS) with a layer sequence of CeO2/YSZ/Ni using an ex situ BaF2 precursor process. Pulsed laser deposition (PLD) was used to deposit both YSZ and CeO2 layers. The YBCO films were grown using e-beam coevaporated Y–BaF2–Cu precursors followed by postannealing. An overall engineering current density, JE, of 28,000 A/cm2 and critical current, Ic, of 147 A/cm width at 77 K were achieved for a 1.6-μm-thick YBCO film. This result demonstrates the possibility of using both the ex situ BaF2 precursor approach and the RABiTS process for producing long lengths of high-JE coated conductors.

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Fabrication of High Jc YBa2Cu3O7-δ Coated Conductors Using Sol-Gel Buffer Layers On Nickel and Nickel Alloy Substrates

MRS Proceedings ◽

10.1557/proc-689-e10.5 ◽

2001 ◽

Vol 689 ◽

Author(s):

S. Sathyamurthy ◽

M. Paranthaman ◽

B. W. Kang ◽

H. Y. Zhai ◽

T. Aytug ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Sol Gel ◽

Rf Sputtering ◽

Cube Texture ◽

Dip Coating ◽

Coated Conductors ◽

Buffer Layers ◽

Ybco Films

Sol-gel processing of La2Zr2O7 (LZO) buffer layers on biaxially textured Ni-3 at.% W alloy substrates using a continuous reel-to-reel dip-coating unit has been studied. The epitaxial LZO films obtained have a strong cube texture and uniform microstructure. The effect of increasing the annealing speed on the texture, microstructure and the carbon content retained in the film were studied. On top of the LZO films, epitaxial layers of Yttria Stabilized Zirconia (YSZ) and Ceria (CeO2) were deposited using rf sputtering, and YBa2Cu3Ox (YBCO) films were then deposited using Pulsed Laser Deposition (PLD). A critical current density (Jc) of 1.9 MA/cm2 at 77K and self-field and 0.34 MA/cm2 at 77K and 0.5T have been obtained on these films. These values are comparable to those obtained on YBCO films deposited on all-vacuum deposited buffer layers, and are the highest ever obtained using solution seed layers. The use of all-solution buffers for coated conductor processing has also been explored. A critical current density of 1.1 MA/cm2 at 77 K and self-field was obtained on YBCO films grown be PLD on LZO buffered nickel substrates.

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Comparison Of Aln Films Synthesized By Pulsed Laser Ablation And Magnetron Sputtering Techniques

MRS Proceedings ◽

10.1557/proc-505-469 ◽

1997 ◽

Vol 505 ◽

Author(s):

K. Jagannadham ◽

A. K. Sharma ◽

Q. Wei ◽

R. Kalyanraman ◽

J. Narayan

Keyword(s):

Magnetron Sputtering ◽

Secondary Ion Mass Spectrometry ◽

Pulsed Laser ◽

Wear Test ◽

Laser Deposition ◽

Grinding Method ◽

Transmission Electron ◽

Infra Red ◽

Bonding Characteristics ◽

Secondary Ion

ABSTRACTA comparative study is reported on the aluminum nitride (AIN) films on Si (111) substrate deposited by pulsed laser deposition and reactive magnetron sputtering. The structure, bonding characteristics, relative impurity levels, and wear resistance have been investigated to compare these films. We have used the techniques such as high resolution transmission electron microscopy, Raman spectroscopy, fourier transform infra-red spectroscopy, secondary ion mass spectrometry, and crater grinding method for wear test, to delineate differences between these AIN films.

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Comparative Study of Thickness Dependence of Critical Current Density of Yba2Cu3O7–δ on (100) SrTiO3 and on Rolling-assisted Biaxially Textured Substrates

Journal of Materials Research ◽

10.1557/jmr.2002.0259 ◽

2002 ◽

Vol 17 (7) ◽

pp. 1750-1757 ◽

Cited By ~ 71

Author(s):

B. W. Kang ◽

A. Goyal ◽

D. F. Lee ◽

J. E. Mathis ◽

E. D. Specht ◽

...

Keyword(s):

Surface Morphology ◽

Critical Current Density ◽

Film Thickness ◽

Comparative Study ◽

Critical Current ◽

Current Density ◽

Pulsed Laser ◽

Cube Texture ◽

Laser Deposition ◽

Ybco Films

We investigated the dependence of critical current density (Jc) on thickness of Yba2Cu3O7−δ (YBCO) films grown by pulsed laser deposition on (100) SrTiO3 (STO) and on rolling-assisted biaxially textured substrates (RABiTS). The thickness of YBCO films varied from 0.19 to 3 μm. The highest Jcs of 5.3 and 2.6 MA/cm2 at 77 K, self-field were obtained for 0.19-μm YBCO films on STO and RABiTS, respectively. Jc was found to decrease exponentially with YBCO thickness on both substrates. However, the results suggest different mechanisms are responsible for the Jc reduction in the two cases. On STO, growth of a-axis grains within c-axis films and broadening of the in-plane texture were observed in thick films. On RABiTS, degradation in cube texture as well as development of a porous surface morphology were found to correlate with film thickness.

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Laser Ablation Deposited YBa2Cu3Ox, Thin Films on YSZ/Si(100)

MRS Proceedings ◽

10.1557/proc-285-299 ◽

1992 ◽

Vol 285 ◽

Cited By ~ 1

Author(s):

F. Sánchez ◽

M. Varela ◽

X. Queralt ◽

R. Aguiar ◽

J.L. Morenza

Keyword(s):

Mass Spectrometry ◽

Thin Films ◽

Laser Ablation ◽

Secondary Ion Mass Spectrometry ◽

Buffer Layers ◽

Metallic Behavior ◽

Ybco Films ◽

Ion Mass Spectrometry ◽

Zero Resistance ◽

Secondary Ion

ABSTRACTSuperconducting YBa2Cu3Ox (YBCO) thin films have been deposited on Si(100) substrates with yttria-stabilized zirconia (YSZ) buffer layers by laser ablation. Buffers have been obtained by laser ablation as well. The films have been characterized by scanning electron microscopy, x-ray diffractometry, secondary ion mass spectrometry, and four-contact electrical resistivity measurements. Secondary ion mass spectrometry results indicate very low interdiffusion between Si, YSZ and YBCO. The best YBCO films are textured with c axis perpendicular to the substrate and their resistance shows a normal state metallic behavior with zero resistance at temperatures higher than 80 K. The properties of YBCO films have been related with the substrate temperature and oxygen partial pressure during deposition.

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YBCO-Coated Conductors Manufactured by High-Rate Pulsed Laser Deposition

MRS Bulletin ◽

10.1557/mrs2004.165 ◽

2004 ◽

Vol 29 (8) ◽

pp. 583-589 ◽

Cited By ~ 45

Author(s):

Alexander Usoskin ◽

Herbert C. Freyhardt

Keyword(s):

Pulsed Laser Deposition ◽

High Temperature Superconductors ◽

Pulsed Laser ◽

Critical Currents ◽

Coated Conductors ◽

Laser Deposition ◽

High Rate ◽

Quasi Equilibrium ◽

Ybco Films ◽

Ybco Coated Conductors

AbstractHigh-temperature superconductors of the second generation—coated conductors—are based on an architecture of YBCO films deposited on a well-textured substrate tape. The deposition technique used in the processing of YBCO films is responsible not only for both the resulting critical currents in the conductors and the cost efficiency of the employed production route, but also for the ultimate viability of the chosen technology. This article describes an advanced deposition method for YBCO films using high-rate pulsed laser deposition (HR-PLD).An elaborate variable azimuth ablation allows target roughening to be considerably reduced in the course of continuous deposition, and as a result, the integral deposition speed and speed stability can be increased to technologically interesting high values.Well-selected process parameters have been demonstrated to yield high currents of up to 480A/cm-width in short tapes and 360A/cm-width in 6-m-long tapes.Together with quasi-equilibrium heating, the HR-PLD method allows the processing of long-length YBCO-coated conductors and offers a cost-efficient route for their production on an industrial scale.

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