Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Aytuğ, Tolga; Paranthaman, M.; Gapud, A.A.; Kang, Suhyun; Christen, Hans M.; Leonard, Keith J.; Martin, Patrick; Thompson, James R.; Christen, D. K.; Meng, R. L.; Rusakova, Irene; Chu, C. W.; Johansen, T. H.

doi:10.1063/1.2138370

Cited by 82 publications

(40 citation statements)

References 24 publications

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“…The H irr was significantly increased for the YBCO + BaSnO 3 films at both 65 and 77 K as compared to YBCO. The value of H irr for YBCO+BaSnO 3 films was found to be 8.51 T at 77 K as compared to 6-7 T commonly found for YBCO in the literature [18,19]. The H irr for the YBCO + BaSnO 3 films was found to be 13.4 T at 65 K. Although high irreversibility fields in SmBCO are possible [17], a high H irr value of 8.5 T at 77 K for doped YBCO is determined in this study.…”

Section: Resultsmentioning

confidence: 82%

Flux pinning enhancement in YBa₂Cu₃O_7−xfilms with BaSnO₃nanoparticles

Varanasi,

Barnes,

Burke

et al. 2006

Supercond. Sci. Technol.

135

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION University of Dayton Research Institute ABSTRACTNanoparticles of BaSnO 3 were incorporated into YBa 2 Cu 3 O 7-x (YBCO) films on LaAlO 3 substrates for magnetic flux pinning enhancements. More than an order of magnitude improvement in the high field magnetization J c at 6 T at 77 K was observed as compared to regular YBCO films. The irreversibility field (H irr ) was increased to 8.5 T at 77 K and to 13.4 T at 65 K. The in-field transport current measurements confirmed an order of magnitude improvement in high fields. More than an order of magnitude improvement in the high field magnetization J c at 6 T at 77 K was observed as compared to regular YBCO films. The irreversibility field (H irr ) was increased to 8.5 T at 77 K and to 13.4 T at 65 K. The in-field transport current measurements confirmed an order of magnitude improvement in high fields. The angular dependence of the J c data at 1 T showed that J c H c is 1.3 times higher than J c H ab indicating the presence of c-axis correlated defects. Transmission electron microscopy studies revealed the presence of a large density of uniformly distributed ∼10 nm sized BaSnO 3 precipitates and strain fields around them. A dual sector pulsed laser deposition target is used to produce the films, thus eliminating reactions between BaSnO 3 and YBCO during the target preparation stage, but may allow the BaSnO 3 to react locally and create defects that act as pinning centres.

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Section: Resultsmentioning

confidence: 82%

Flux pinning enhancement in YBa₂Cu₃O_7−xfilms with BaSnO₃nanoparticles

Varanasi,

Barnes,

Burke

et al. 2006

Supercond. Sci. Technol.

135

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“…Also some defects were created by growing YBCO fi lms on top of a surface decorated with nanoparticles (surface decoration). Nanoparticles of Ir or MgO are deposited initially on the substrates and then YBCO fi lms were grown on top of these particles to grow fi lms with defects that help to enhance J c [13,14] . In a separate study [15] , nanoparticles of BaTiO 3 and BaZrO 3 were deposited by a solution -based technique onto a substrate prior to growing YBCO layers.…”

Section: Microstructural Defectsmentioning

confidence: 99%

“…13 High -resolution scanning electron images of YBCO+BSO thick fi lms with different thicknesses (denoted by ' t ' ) showing the planar view of the BSO nanorods.…”

mentioning

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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“…One of the good examples is the use of heavy ion irradiation to pin vortex lines [10]. Some of them are stoichiometric and off-stoichiometric YBCO or rare-earth doping by chemical solution method [11,12] or incorporation of epitaxial oxide nanoparticle, the growth of nanosized islands on the substrates by PLD [13] and sputtering [14]. All of them lead to formation of corresponding artificial defects in the consequent deposited YBCO films.…”

mentioning

confidence: 98%

Effects of Sm-doping on Structures and Properties of YBCO Coated Conductors Fabricated by TFA-MOD Process

Wang

Zhang

Jin

et al. 2011

J Supercond Nov Magn

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The Sm-doping YBCO films, Y 1−x Sm x Ba 2 -Cu 3 O y and Y 1 Sm x Ba 2−x Cu 3 O y (x = 0.1, 0.3), were fabricated on LAO (00l) single-crystal substrates by TFA-MOD process in order to improve the superconducting properties of YBCO films. The XRD analyses indicated that these samples have a strong c-axis texture, but the secondary phase of BaCuO 2 are found from Y 1 Sm x Ba 2−x Cu 3 O y films with Sm 3+ substitution on Ba 2+ sites. High quality surface, better in-plane and out-of-plane texture of the Sm-doping films have been obtained compared with that of the undoped YBCO film. The Y 0.9 Sm 0.1 Ba 2 Cu 3 O y films showed the highest value of T c and J c in self-field. Superconducting properties of all Sm-doping films are better than those of the pure film. These results strongly suggest that Smsubstitution on Y or Ba sites of YBCO phase is a powerful method to efficiently improve J c and introduce artificial pinning centers in YBCO films.

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Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Cited by 82 publications

References 24 publications

Flux pinning enhancement in YBa₂Cu₃O_7−xfilms with BaSnO₃nanoparticles

Flux pinning enhancement in YBa₂Cu₃O_7−xfilms with BaSnO₃nanoparticles

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

Effects of Sm-doping on Structures and Properties of YBCO Coated Conductors Fabricated by TFA-MOD Process

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Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Cited by 82 publications

References 24 publications

Flux pinning enhancement in YBa2Cu3O7−xfilms with BaSnO3nanoparticles

Flux pinning enhancement in YBa2Cu3O7−xfilms with BaSnO3nanoparticles

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

Effects of Sm-doping on Structures and Properties of YBCO Coated Conductors Fabricated by TFA-MOD Process

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Product

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Flux pinning enhancement in YBa₂Cu₃O_7−xfilms with BaSnO₃nanoparticles

Flux pinning enhancement in YBa₂Cu₃O_7−xfilms with BaSnO₃nanoparticles

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