Deposition of (Y2BaCuO5/YBa2Cu3O7−x)×N multilayer films on Ni-based textured substrates

Haugan, Timothy J.; Barnes, Paul N.; Campbell, T A; Goyal, A.; Gapud, A.A.; Heatherly, L.; Kang, Suhyun

doi:10.1016/j.physc.2005.05.013

Cited by 11 publications

(11 citation statements)

References 15 publications

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“…There are several previous studies where, more or less arbitrary, ML structures have provided enhanced J c when compared with corresponding single layer films [23,[25][26][27][28][29]. This suggests that both the range of applicability and the properties of HTS films can be further enhanced with systematic optimization and understanding of the complex ML structures.…”

Section: Introductionmentioning

confidence: 96%

Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation

Rivasto

Hynninen

Huhtinen

et al. 2022

J. Phys.: Condens. Matter

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We argue that the current carrying properties of high-temperature superconducting thin films can be further improved, in particular under the mid-field range (B≈0.1-2 T), via introduction of multilayer structures that compromise between good zero field critical current and vortex pinning performance. In this work we focus on a simple bilayer structure consisting of two adjacent layers of pure YBa2Cu3O6+x (YBCO) and BaZrO3 (BZO) doped YBCO under magnetic field within the mid-field range oriented parallel to the c-axis of the YBCO unit cell. We have utilized a computational model to simulate the vortex dynamics limited critical current separately from the associated zero field current, which is addressed analytically. The obtained results have allowed us to estimate the optimal layer thicknesses as a function of magnetic field. Our idealized model suggests that the thickness of the doped layer should be substantially smaller than the undoped one, that is around 30% of the total thickness of the film. We have estimated that the current carrying capability of the optimized bilayer structure can be up to 50% higher when compared with corresponding single layer films. Possible deviations from the obtained results associated with the idealized model, most prominently the effect of natural defects, are comprehensively discussed. Our results provide the foundation for the future experimental realization of the proposed bilayer structures. The comparison between the presented results and experimental realization would enable further study of the underlying primitive vortex interactions.

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Section: Introductionmentioning

confidence: 96%

Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation

Rivasto

Hynninen

Huhtinen

et al. 2022

J. Phys.: Condens. Matter

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“…A practical development from single crystal substrates is rolling assisted biaxially textured substrate (RABiTS) [7]. It is reported [8] that the J c on RABiTS is comparable to the J c on single crystals in self-field.…”

Section: Introductionmentioning

confidence: 99%

PrBa₂Cu₃O_7-xas an insulating layer for YBCO multilayer coated conductors

Tanner

Hirst²,

Maher³

et al. 2008

J. Phys.: Conf. Ser.

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Abstract.A study into the insulating layers for multi-layered coated conductors was undertaken in an effort to achieve high critical current density throughout the different layers of the structure. Single thin films of YBCO were grown, then covered with dielectric layers, onto single crystal and buffered, nickel, textured substrates using pulsed laser deposition. By using a combination of shadow masking and photolithography techniques, transport currents were measured through the layer to obtain its critical current density (J c ). Additionally electron backscattered diffraction was employed to characterise the films. PrBa 2 Cu 3 O 7-x was shown to maintain high J c across the sample, thus maximising the overall engineering current density.

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“…[2][3][4] Many methods of introducing defects can be considered to increase flux pinning in YBCO, [2][3][4] and recent efforts have studied the use of (M x /123 y ) N heterostructures to introduce~3 to 20 nm-size island-growth nanoparticles or even larger-diameter plate-like defects into the films. [5][6][7][8][9][10][11][12][13][14][15][16][17] A number of different second-phase additions M have been tested, including M = green-phase 211, 5-12 Y 2 O 3 , 11,12,14,15 CeO 2 , [11][12][13] IrZrO 3 , 16 BaZrO 3 , 17 and other phases with negative effects on T c and/or J c (H) including M = La211, 11,12 MgO, 11,12 and Sm123. 12 Studies of (M x /123 y ) N heterostructures can provide basic information about the relative pinning properties of different M phases, and specific parameters of flux pinning such as the effects of different layer spacings.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9][10][11][12][13][14][15][16][17] This paper presents a systematic comparison of film properties for selected M phases and different x layer thickness. A significant result observed is that the surface coverage is an important constant factor to optimize flux pinning, regardless of the M phase.…”

Section: Introductionmentioning

confidence: 99%

“…11,12 EXPERIMENTAL Multilayer (M x /123 y ) N films were deposited by pulsed laser deposition (PLD), using the parameters and conditions described in detail previously. [5][6][7][8][9][10][11][12][13][14]17,18 Deposition parameters were 248 nm laser wavelength,~3.2 J/cm 2 laser fluence, 25 nm pulse length, 2 to 4 Hz laser repetition rate, 5.5 cm target-to-substrate distance, 83 to 92% dense targets, 300 mTorr oxygen partial pressure, and a postdeposition anneal at 500°C in 1 atm of oxygen. 18 The heater block temperature varied slightly for the different M phases studied: 775°C for 211, Y 2 O 3 , La211, Sm123 and MgO, 790°C for BaZrO 3 , 17 and 750°C for CeO 2 to avoid the formation of large precipitates that are observed with a higher growth temperature of 775°C to 785°C, 11-13 unless Tetragonal a = 0.67015 a¢¢ = 0.3351 -13.1 ** c = 0.58211 **Epitaxy of Y 2 BaCuO 5 onto 123 is b-axis oriented 6 , so the lattice misfit is calculated for both a¢¢ and c¢¢.…”

Section: Introductionmentioning

confidence: 99%

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Superconducting Properties of (M x /YBa2Cu3O7−δy )N Multilayer Films with Variable Layer Thickness x

Haugan¹,

Barnes²,

Campbell³

et al. 2007

Journal of Elec Materi

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O 7-d (Sm123), brown-phase La 2 BaCuO 5 (La211), and MgO. Multilayer (M x /YBa 2 Cu 3 O 7-dy ) N structures were grown by pulsed laser deposition onto SrTiO 3 or LaAlO 3 single-crystal substrates by alternate ablation of separate YBa 2-Cu 3 O 7-d (123) and M targets, at temperatures of 750°C to 790°C. The x layer thickness was varied from 0.1 nm to 4.5 nm, and the y 123 layer thickness was kept constant within a given range of 10 to 25 nm. Different M phase and x layer thicknesses caused large variations of the microstructural and superconducting properties, including superconducting transition (T c ), critical current density as a function of applied magnetic field J c (H), self-field J c (77 K), and nanoparticle layer coverage. Strong flux-pinning enhancement up to 1 to 3x was observed to occur for M additions of 211 and BaZrO 3 at 65 to 77 K, Y 2 O 3 at 65 K, and CeO 2 for H < 0.5 T. BaZrO 3 had a noticeably different epitaxy forming smaller size nanoparticles~8 nm with 3 to 4x higher areal surface particle densities than other M phases, reaching 5 · 10 11 nanoparticles cm -2 . To optimize flux pinning and J c (65 to 77 K, H = 2 to 3 T), the M layer thickness had to be reduced below a critical value that correlated with a nanoparticle surface coverage <15% by area. Unusual effects were observed for poor pinning materials including Sm123 and La211, where properties such as self-field J c unexpectedly increased with increasing x layer thickness.

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Deposition of (Y2BaCuO5/YBa2Cu3O7−x)×N multilayer films on Ni-based textured substrates

Cited by 11 publications

References 15 publications

Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation

Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation

PrBa₂Cu₃O_7-xas an insulating layer for YBCO multilayer coated conductors

Superconducting Properties of (M x /YBa2Cu3O7−δy )N Multilayer Films with Variable Layer Thickness x

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Deposition of (Y2BaCuO5/YBa2Cu3O7−x)×N multilayer films on Ni-based textured substrates

Cited by 11 publications

References 15 publications

Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation

Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation

PrBa2Cu3O7-xas an insulating layer for YBCO multilayer coated conductors

Superconducting Properties of (M x /YBa2Cu3O7−δy )N Multilayer Films with Variable Layer Thickness x

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PrBa₂Cu₃O_7-xas an insulating layer for YBCO multilayer coated conductors