Thick YBa2Cu3O7−x+BaSnO3 films with enhanced critical current density at high magnetic fields

Varanasi, C.; Burke, J.; Wang, H.; Lee, J. H.; Barnes, Paul N.

doi:10.1063/1.2976683

Cited by 92 publications

(45 citation statements)

References 21 publications

(19 reference statements)

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“…Among these defects, BaMO 3 (BMO, where M = Zr, Sn, and Hf) has received particular attention. [1][2][3][4][5][6][7][8][9] In fact, introduction of BMO into the REBCO films has been proven effective in improving the critical current density (J c ) of the films via enhanced vortex pinning by the defects. The optimized doping level of BMO (M = Sn or Hf)-doped REBCO (RE = Y or Sm) films on single-crystalline substrates has exhibited high flux pinning force density (F p ) of over 25 GN/m 3 at 77 K and B//c.…”

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Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

et al. 2016

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For use in high-magnetic-field coil-based applications, the critical current density (Jc) of REBa2Cu3Oy (REBCO, where RE = rare earth) coated conductors must be isotropically improved, with respect to the direction of the magnetic field; these improvements must be realized at the operating conditions of these applications. In this study, improvement of the Jc for various applied directions of magnetic field was achieved by controlling the morphology of the BaHfO3 (BHO) nano-rods in a SmBCO film. We fabricated the 3.0 vol. % BHO-doped SmBCO film at a low growth temperature of 720 °C, by using a seed layer technique (Ts = 720 °C film). The low-temperature growth resulted in a morphological change in the BHO nano-rods. In fact, a high number density of (3.1 ± 0.1) × 103 μm−2 of small (diameter: 4 ± 1 nm), discontinuous nano-rods that grew in various directions, was obtained. In Jc measurements, the Jc of the Ts = 720 °C film in all directions of the applied magnetic field was higher than that of the non-doped SmBCO film. The Jcmin (6.4 MA/cm2) of the former was more than 6 times higher than that (1.0 MA/cm2) of the latter at 40 K, under 3 T. The aforementioned results indicated that the discontinuous BHO nano-rods, which occurred with a high number density, exerted a 3D-like flux pinning at the measurement conditions considered. Moreover, at 4.2 K and under 17 T, a flux pinning force density of 1.6 TN/m3 was realized; this value was comparable to the highest value recorded, to date.

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Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

et al. 2016

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“…TEM images show long BSO nanocolumns that extend throughout the thickness of the fi lms, as shown in Figure 5 nanocolumns was approximately 2.5 × 10 11 cm − 2 , and the average size was 10 -11 nm. As compared to BaZrO 3 , nanocolumns of BSO seem to grow straight, and, as a result of this microstructure, thick fi lms continue to have higher J c [41] . The strain between BSO and YBCO seems to help to grow such nanocolumns [42] .…”

Section: High -Quality Ybco + Bso Thick Filmsmentioning

confidence: 99%

Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications

Varanasi

Barnes

2010

High Temperature Superconductors

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5.1 IntroductionCoated conductors are electrical conductors prepared with YBa 2 Cu 3 O 7 -x ( YBCO ) superconducting material coatings deposited on metallic substrates along with several other intermediate buffer layers. Buffer layers are deposited sequentially on the metallic substrates prior to YBCO deposition to serve as barrier layers. They are selected such that epitaxial relationships are maintained throughout the thickness of the coated conductors to obtain highly -textured YBCO coatings. To process conductors with high critical current density ( J c ), highly -textured YBCO coatings with both in -plane and out -of -plane alignment of grains are required with grain boundary misorienation angles below 5 o . More details of the texture requirements, processing, and different types of coated conductor architectures can be found in other chapters of this book as well as in the references [1 -5] . Two primary industrial approaches are used to manufacture the coated conductors. One approach uses a rolling assisted biaxially textured (RABiTS ™ ) metallic substrate such as N -5 at.% W with sputtered Y 2 O 3 /YSZ/Ce 2 O 3 buffer layers and YBCO layer deposited by the metallo -organic deposition ( MOD ) technique [3] . In the second approach, a polycrystalline Hastealloy ™ substrate is coated with textured MgO buffer layer grown by ion beam assisted deposition ( IBAD ) and other subsequent buffer layers [4] . YBCO is deposited by metallo -organic chemical vapor deposition ( MOCVD ) on these substrates. In recent years, impressive progress has been made in the manufacturing of long lengths of YBCO coated conductors processed by using both the RABiTS ™ substrates as well as IBAD substrates [6,7] . Such longlength coated conductors are needed to make coils for rotating machinery and cables for electrical transmission. However, in high magnetic fi eld applications such as MRI (Magnetic Resonance Imaging), SMES (Superconducting Magnetic Energy Storage), superconducting magnets and generators, etc., high J c at high magnetic fi elds needs to be maintained. In the absence of fl ux pinning centers in the coated conductors, the magnetic fl ux lines will move due to Lorenz forces acting upon them at high fi elds. This motion causes dissipation, and losses will occur as a result. This lowers the J c in coated conductors. Hence, it is important High Temperature Superconductors. Edited by Raghu Bhattacharya and M. Parans Paranthaman

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“…However, there are reports [1,2] which suggest that majority of these naturally occurring defects are either not effective enough to suppress the thermal fluctuations or their densities not high enough to maintain the necessary levels of critical current density at large magnetic fields. In recent years, substantial improvement in the critical current density of YBCO thin film in a wide range of magnetic field has been achieved by inclusion of nanoparticulates of non-superconducting materials such as YBa 2 CuO 5 [3], BaZrO 3 [4][5][6], BaIrO 3 [7], BaHfO 3 [8], BaSnO 3 [9], Y 2 O 3 [10], Ba 2 GdTaO 6 [11] in YBCO matrix. There has been lot of interest in understanding the mechanism of pinning in YBCO based superconducting nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Flux Pinning Mechanism in Laser Ablated YBCO and YBCO:BaZrO3 Nanocomposite Thin Films

Jha

Khare

Pinto

2011

J Supercond Nov Magn

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Thin films of YBCO and YBCO:BaZrO 3 (BZO) nanocomposite have been deposited using the pulsed laser deposition technique. Substantial increase in critical current density (J C ) and pinning force density (F p ) of the nanocomposite thin films was observed. The possible pinning mechanism in YBCO:BZO nanocomposite thin films has been explored and compared with the pinning mechanism in pure YBCO thin film by studying the variation of J C with magnetic field (B) and temperature. In the intermediate field regime (0.1-1 T), J C follows B −α with nearly similar values of α for YBCO and YBCO:BZO nanocomposite thin films indicating similar pinning mechanism in both thin films. The variation of J C with reduced temperature (t = T /T C ) has been studied for both the films and it was observed that the mechanism of pinning in both YBCO and YBCO:BZO thin films is similar (δT C pinning). The observed enhanced values of J C and F p of the nanocomposite thin film is attributed to the presence of BZO nanoparticles, which induces more defects due to lattice mismatch between YBCO and BZO leading to improved flux pinning properties of the nanocomposite thin film.

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Thick YBa2Cu3O7−x+BaSnO3 films with enhanced critical current density at high magnetic fields

Cited by 92 publications

References 21 publications

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications

Comparison of Flux Pinning Mechanism in Laser Ablated YBCO and YBCO:BaZrO3 Nanocomposite Thin Films

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Thick YBa2Cu3O7−x+BaSnO3 films with enhanced critical current density at high magnetic fields

Cited by 92 publications

References 21 publications

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Flux Pinning Enhancement in YBa 2 Cu 3 O 7–x Films for Coated Conductor Applications

Comparison of Flux Pinning Mechanism in Laser Ablated YBCO and YBCO:BaZrO3 Nanocomposite Thin Films

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Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications