Growth of High-Performance 4-5μm Thick Film REBCO Tapes Doped With Hafnium Using Advanced MOCVD

Paidpilli, Mahesh; Pratap, Rudra; Kochat, Mehdi; Galstyan, Eduard; Goel, Chirag; Majkic, Goran; Selvamanickam, V.

doi:10.1109/tasc.2021.3060366

Cited by 13 publications

(9 citation statements)

References 22 publications

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“…© IOP Publishing Ltd. All rights reserved. at 4.2 K, 16 T and 15 mol.% Hf-added tape showed J c > 9 MA cm −2 at 20 K, 9 T [39,46]. As shown in figure 3, the J c and F p levels of 4.6 µm thick Advanced MOCVD tape are even slightly higher than the corresponding levels of 0.9 µm thick MOCVD tape, which indicates the efficacy of the Advanced MOCVD process to fabricate high-quality tapes even with thick films.…”

Section: Low Field High-temperature Rebcomentioning

confidence: 93%

“…While at that time, the improvement was attributed primarily to the higher level of Zr addition, it has now been found that the Ba content plays the primary role in determining the microstructure of the columnar defects, the accompanying strain and in turn, the in-field performance [38]. Thus, a superior performance can now be achieved even with 5 mol.% Zr addition [38,39].…”

Section: Low Field High-temperature Rebcomentioning

confidence: 99%

“…Even if the critical current at 77 K, 0 T is uniform over long lengths, it is likely that the critical current in high magnetic fields at 4.2 K is not uniform. Tapes with superior high-field performance enabled by as-grown BaMO 3 (M = Zr, Hf, Sn) nanoscale defects that exhibit excellent flux pinning [8][9][10][11][12][13][14][33][34][35][36][37][38][39] are especially prone to non-uniformity because of the sensitivity of in-field critical current to the film composition and nanoscale defect structure. Innovative methods for real-time control of the film composition and nanoscale defect structure over kilometer lengths in a narrow process window is very important.…”

Section: Long Tapes With Uniform Critical Currentmentioning

confidence: 99%

See 2 more Smart Citations

Development of RE-Ba-Cu-O superconductors in the U.S. for ultra-high field magnets

Paidpilli

Selvamanickam

2022

Supercond. Sci. Technol.

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High-temperature superconductors (HTS) make it possible to achieve magnetic fields beyond the 23.5 T limit of low-temperature superconductors (LTS). For higher energy density, high-performance HTS with Je > 1000 A/mm2 enable reduction in coil winding length and a smaller magnet size. Among HTS, REBa2Cu3O7-δ (REBCO, RE = rare earth) exhibits excellent mechanical properties and superior performance over a wide range of temperatures and magnetic fields. REBCO tapes can be converted to various formats, including round wires. The state-of-the-art REBCO superconductors for ultra-high field magnets, including cable/wire architectures, are reviewed. R&D needs to address remaining challenges with REBCO superconductors for ultra-high magnetic field applications are discussed.

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Section: Low Field High-temperature Rebcomentioning

confidence: 93%

Section: Low Field High-temperature Rebcomentioning

confidence: 99%

Section: Long Tapes With Uniform Critical Currentmentioning

confidence: 99%

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Development of RE-Ba-Cu-O superconductors in the U.S. for ultra-high field magnets

Paidpilli

Selvamanickam

2022

Supercond. Sci. Technol.

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“…However, to simplify the current analysis we only discuss the mechanical effects between the Hastelloy and the superconductor. More details about the synthesis and compositions of the tapes are available in refs , , and − .…”

Section: Methodsmentioning

confidence: 99%

Accurate Ruby Sensor for Stress Analysis in Electronics

Yang

Cortés-Vega

Ahmadi

et al. 2022

ACS Appl. Electron. Mater.

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In this work, we present a simple and cost-effective method to produce a stress sensor based on the luminescence response of ruby thin films. The proposed sensor has a multilayer configuration between the target film of YBa2Cu3O7‑δ (YBCO), the nickel tape substrate, and a ruby thin film, among others. The ruby film is deposited by sputtering, and the YBCO was deposited by A-MOCVD on the opposite surface on the top of the Ni-tape substrate. The performance of the sensor is estimated by calculating the residual stresses of the YBCO thin film after deposition. The analysis is conducted using Raman spectroscopy, where the shift of the luminescent lines of ruby are used to determine the residual stress built up, which is extrapolated by means of the Stoney equation to the REBCO film. The calculated residual stress in the ruby sensor is from 0.56 to 0.625 GPa, which translates to 1.50–1.68 GPa in the REBCO film. Further confirmation of the residual stress value in the REBCO film is done using the Stoney equation, resulting in a stress value of 1.55 GPa. This demonstrates the accuracy of the method. The sensitivity, easy processing, reliability, and low cost of the ruby thin films make of them a highly desirable option for their application as stress sensors for a wide variety of applications, including electronics.

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“…REBCO films are usually deposited on a biaxially-textured buffer layer either by chemical routes including metalorganic chemical vapor deposition (MOCVD) [5], metal-organic deposition (MOD) [6], or by physical vapor deposition routes including pulsed laser deposition (PLD) [7,8] and reactive co-evaporation (RCE) [9]. University of Houston developed Advanced MOCVD to grow REBCO layer with high critical current density (J c) and film thickness as high as 5 μm in a single pass [10,11]. A critical current (Ic) of 1836 A has been achieved at 4.2 K, 20 T which corresponds to an engineering current density of 4,600 A/cm 2 based on 0.1 mm thick tape [12].…”

Section: Introductionmentioning

confidence: 99%

Structure-property-process parameter correlation in the Advanced MOCVD growth of 4+ μm REBCO thick films over 10+ m

Paidpilli

Boyina

Shyam

et al. 2022

J. Phys.: Conf. Ser.

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REBCO (REBa2Cu3O7−δ ) coated conductor with Je > 1000 A/mm2 at operating condition is being utilized in fusion and high-field-magnet applications. We have demonstrated short REBCO samples with an engineering current density (Je ) ~ 4,600 A/mm2 (based on 0.1 mm thick tape) at 4.2 K, 20 T using Advanced Metal-Organic Chemical Vapor Deposition (A-MOCVD). In order to achieve such high performance uniformly over long tapes, defective regions in thick films need to be avoided. In this work, we investigated parameters that cause dropout or variation in the critical current along the length of long tapes made by A-MOCVD. By addressing the engineering challenges of growing 4+ μm thick REBCO films in a single pass, 10+ m long tapes with high critical current that varies < 5% along the length have been fabricated.

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Growth of High-Performance 4-5μm Thick Film REBCO Tapes Doped With Hafnium Using Advanced MOCVD

Cited by 13 publications

References 22 publications

Development of RE-Ba-Cu-O superconductors in the U.S. for ultra-high field magnets

Development of RE-Ba-Cu-O superconductors in the U.S. for ultra-high field magnets

Accurate Ruby Sensor for Stress Analysis in Electronics

Structure-property-process parameter correlation in the Advanced MOCVD growth of 4+ μm REBCO thick films over 10+ m

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