Magnetic Field Dependence of Critical Current Density of PLD RE-Ba-Cu-O (RE=Gd, Sm, Dy, Er, Y) Film on CeO2 Capped IBAD-GZO Layers

AbstractWe prepared REBa2Cu3O7- δ (RE= Gd, Sm, Dy, Er, Y) coated conductors on pulsed laser deposition (PLD) -CeO2/ion-beam assisted deposition (IBAD) – Gd2Zr2O7 (GZO) / metal tapes by the PLD method and measured the characteristics in magnetic fields. The GdBa2Cu3O7- σ (Gd-123) films showed superior characteristics than others in magnetic fields and showed weak anisotropy. Critical current density (Jc) value of the Gd-123 film was 3.87MA/cm2 at self-field and 0.19MA/cm2 at 3 T of perpendicular field to the tape surface in liquid nitrogen (77 K). Angular dependences in magnetic fields (Jc -Θ) of the Gd-123 and the SmBa2Cu3O7- σ (Sm-123) were superior to others and peaks in Jc -Θ were found also at 0 degree. The reduction ratios of Jc in Jc -Θ for the Gd-123 film and the Sm-123 film were smaller than other films. Transmission electron microscopy showed that the Gd-123 film had many stacking faults. It may be considered that this stacking faults naturally introduced by the PLD method contribute to improvement of anisotropy of Jc -Θ in the Gd-123 film.

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High critical current density YBa2Cu3O7δ thick films using ion beam assisted deposition MgO bi-axially oriented template layers on nickel-based superalloy substrates

Journal of Materials Research ◽

10.1557/jmr.2001.0295 ◽

2001 ◽

Vol 16 (8) ◽

pp. 2175-2178 ◽

Cited By ~ 30

Author(s):

J. R. Groves ◽

P. N. Arendt ◽

S. R. Foltyn ◽

Q. X. Jia ◽

T. G. Holesinger ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Ion Beam ◽

Continuous Process ◽

Coated Conductors ◽

Nickel Based Superalloy ◽

Ion Beam Assisted Deposition ◽

Out Of Plane ◽

Amorphous Si

Nickel-based superalloys have been coated with magnesium oxide (MgO) using ion-beam-assisted deposition (IBAD). This technique produced a well-oriented bi-axially textured MgO template layer with a Ф scan full width half maximum of 6.4°. The layer architecture for these samples was as follows: polished hastelloy C276/amorphous Si3N4/IBAD MgO/ pulsed laser deposited (PLD) Y2O3–ZrO2/PLD CeO2/PLD YBa2Cu3O7?δ. The subsequent heteroepitaxial PLD of 1.5-mm-thick YBCO showed a nominal critical current density of over 1 MA/cm2 (75 K, self-field) along a microbridge and had an in-plane mosaic spread of 4.8° and an out-of-plane spread of 1.3°. These results compare well with our earlier work using IBAD yttria-stabilized zirconia (YSZ) as a template layer and indicate that IBAD MgO is a suitable substitute. Furthermore, these results suggest that IBAD MgO could be adapted to and increase the feasibility of a continuous process to fabricate longer lengths of coated conductors at speeds 100 times faster than that previously realized with IBAD YSZ.

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Growth of thick Yba2Cu3O7−δ films carrying a critical current of over 230 A/cm on single LaMnO3-buffered ion-beam assisted deposition MgO substrates

Journal of Materials Research ◽

10.1557/jmr.2003.0289 ◽

2003 ◽

Vol 18 (9) ◽

pp. 2055-2059 ◽

Cited By ~ 37

Author(s):

M. Paranthaman ◽

T. Aytug ◽

D. K. Christen ◽

P. N. Arendt ◽

S. R. Foltyn ◽

...

Keyword(s):

Critical Current ◽

Current Density ◽

Ybco Film ◽

High Current Density ◽

Ion Beam ◽

Coated Conductors ◽

High Current ◽

Ion Beam Assisted Deposition ◽

Ni Alloy ◽

Ybco Coated Conductors

A single LaMnO3 buffer layer was developed for the growth of superconducting thick YBa2Cu3O7−δ (YBCO) films on polycrystalline Ni-alloy substrates where a biaxially textured MgO layer, produced by ion-beam assisted deposition (IBAD), was used as a template. Using pulsed laser deposition, a 1.65-μm-thick YBCO film with a critical current density of 1.4 × 106 A/cm2 in self field at 75 K was achieved on sputtered LaMnO3-buffered IBAD MgO substrates. This corresponds to a critical current (Ic) of 231 A/cm-width. This result demonstrates the possibility of using both LaMnO3 buffer and IBAD MgO template for producing high current density YBCO-coated conductors.

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Scanning Hall-probe microscopy system for two-dimensional imaging of critical current density in RE-123 coated conductors

Physica C Superconductivity ◽

10.1016/j.physc.2011.05.118 ◽

2011 ◽

Vol 471 (21-22) ◽

pp. 1036-1040 ◽

Cited By ~ 22

Author(s):

K. Higashikawa ◽

M. Inoue ◽

T. Kawaguchi ◽

K. Shiohara ◽

K. Imamura ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Coated Conductors ◽

Hall Probe ◽

Two Dimensional ◽

Probe Microscopy ◽

Scanning Hall Probe Microscopy

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Critical current density and microstructure variations in YBa2Cu3O7−x + BaSnO3 films with different concentrations of BaSnO3

Journal of Materials Research ◽

10.1557/jmr.2008.0412 ◽

2008 ◽

Vol 23 (12) ◽

pp. 3363-3369 ◽

Cited By ~ 23

Author(s):

C.V. Varanasi ◽

J. Burke ◽

L. Brunke ◽

H. Wang ◽

J.H. Lee ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Gradual Increase ◽

Critical Transition ◽

Critical Transition Temperature ◽

Transmission Electron ◽

Order Of Magnitude ◽

High Fields ◽

Magnitude Increase

Previous work on YBa2Cu3O7−x (YBCO) + BaSnO3 (BSO) films with a single composition showed significant critical current density (Jc) improvements at higher fields but lowered Jc in low fields. A detailed study on BSO concentrations provided here demonstrates that significant Jc enhancement can occur even up to 20 mol% BSO inclusion, where typical particulate inclusions in these concentrations degrade the YBCO performance. YBCO + BSO films were processed on (100) LaAlO3 substrates using premixed targets of YBa2Cu3O7-x (YBCO) with additions of 2, 4, 10, and 20 mol% BSO. The critical transition temperature Tc of the films remained high (>87 K), even with large amounts (20 mol%) of BSO. YBCO + BSO films showed a gradual increase in Jc at high fields as the amount of BSO was increased. More than an order of magnitude increase in Jc was measured in YBCO + BSO samples as compared to regular YBCO at 4 T. YBCO + 10 mol% BSO films showed overall improvement at all the field ranges while YBCO + 20 mol% BSO was better only at high fields. Transmission electron microscopy revealed the presence of ∼7–8-nm-diameter BSO nanocolumns, the density of which increased with increasing BSO content correlating well with the observed improvements in Jc.

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