Enhancement of critical current density in YBa2Cu3O7 films using a semiconductor ion implanter

Matsui, H.; Ootsuka, Teruhisa; Ogiso, Hisato; Yamasaki, H.; Sohma, M.; Yamaguchi, Iwao; Kumagai, Toru; Manabe, Takaaki

doi:10.1063/1.4906782

Cited by 24 publications

(26 citation statements)

References 32 publications

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“…Some of the earlier irradiation studies were carried out on YBCO films with no Ag coating or at most an extremely thin layer [9]. However, studies have shown that the post annealing of the samples at temperatures above 300 o C essentially removes the defects from the YBCO film.…”

Section: B Short Sample Irradiationmentioning

confidence: 99%

Engineered Pinning Landscapes for Enhanced 2G Coil Wire

Rupich

Sathyamurthy

Fleshler

et al. 2016

IEEE Trans. Appl. Supercond.

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We demonstrate a 2-fold increase of the in-field critical current of AMSC's standard 2G coil wire by irradiation with 18 MeV Au ions. The optimum pinning enhancement is achieved with a dose of 6x10 11 Au ions/cm 2 . Although the 77 K, self-field critical current is reduced by about 35%, the in-field critical current (H//c) shows a significant enhancement between 4 -50K in fields >1 T. The process was used for the roll-to-roll irradiation of AMSC's standard 46 mm wide production coated conductor strips which were further processed in to standard copper laminated coil wire. The long length wires show the same enhancement as attained with short static irradiated samples. The roll-to-roll irradiation process can be incorporated in the standard 2G wire manufacturing with no modifications to the current process. The enhanced performance of the wire will benefit rotating machine and magnet applications.

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Section: B Short Sample Irradiationmentioning

confidence: 99%

Engineered Pinning Landscapes for Enhanced 2G Coil Wire

Rupich

Sathyamurthy

Fleshler

et al. 2016

IEEE Trans. Appl. Supercond.

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“…Their effect on vortex pinning in superconductors as diverse as HTS single crystals and epitaxial films [19][20][21][22][23][24][25] and Fe-based superconductors [26,27] has been extensively studied. However, only recently has their potential for improving the performance of commercial coated conductors been explored [28][29][30][31][32][33][34][35]. In particular, in our previous work [29] we have demonstrated that the in-field critical current density of short samples cut from production-line coated conductors can be doubled using irradiation with 4 MeV protons.…”

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confidence: 99%

Rapid doubling of the critical current of YBa2Cu3O7−δ coated conductors for viable high-speed industrial processing

Leroux

Kihlstrom

Holleis

et al. 2015

Applied Physics Letters

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We demonstrate that 3.5-MeV oxygen irradiation can markedly enhance the in-field critical current of commercial 2 nd generation superconducting tapes with an exposure time of just one second per 0.8 cm 2 . The speed demonstrated here is now at the level required for an industrial reel-to-reel post-processing. The irradiation is made on production line samples through the protective silver coating and does not require any modification of the growth process. From TEM imaging, we identify small clusters as the main source of increased vortex pinning. 2Increasing the current carrying capacity of 2 nd generation (2G) YBCO high temperature superconducting (HTS) wires in the presence of high magnetic fields is critical for the commercialization of HTS based rotating machine applications such as lightweight and compact off-shore wind turbines and motors as well as various HTS magnet applications [1][2][3][4]. For these, operation in magnetic fields of several Tesla and at temperatures around 30K is envisioned. Although conductors of hundreds of meters in length with self-field critical current densities J c of more than 3 -4 MA/cm 2 (more than 300 -400 A/cm-width) at 77 K can now reliably be manufactured, the rapid suppression of J c in even modest applied magnetic fields continues to be a major challenge for HTS conductor development.In recent years, impressive advances in the in-field performance of short-length samples have been achieved [5][6][7][8][9][10], largely due to the strict control over the micro-and nanostructures. The formation of the desired pinning centers depends sensitively on the film deposition technique and substrate architecture. For instance, self-assembled nanorods can be engineered in films grown by pulsed laser deposition (PLD) or MOCVD from material containing excess metal oxides such as BaZrO 3 [11][12][13][14], BaSnO 3 [15] or BaHfO 3 [16], whereas the deposition of films with excess Zr using metal organic deposition (MOD) on single-crystal substrates [17] and on IBAD substrates [18] does not yield nanorods but nanoparticles. In general, the enhanced vortex pinning arises from the complex combined effects of the introduced second phases (nanorods or nanoparticles), additional structural disorder such as twin boundaries, stacking faults and point defects, as well as from isotropic pinning due to strain fields [5,17]. In short-length samples, critical current densities as high as ~ 7 MA/cm 2 at 30 K and 9 T applied parallel to caxis have been reported [9]. The translation of these advances into a reliable large-scale production process is a time consuming process currently under development.An alternative to increase the critical current density by modifying the chemical synthesis is afforded by particle irradiation, which may be applicable to all superconducting materials. Depending on the mass and energy of the ions and the properties of the superconducting material, irradiation enables the creation of defects with well-controlled density and topology, such as points, clusters or tracks. The...

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“…In this article, we explore the case of monodisperse spherical defects with the size of a few coherence lengths which model nanoparticles in coated YBCO conductors. In addition, similar pinning centers in the form of impurity clusters can be introduced by proton irradiation which provides an opportunity for further enhancement of the critical current [10,11].…”

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confidence: 99%

Optimization of vortex pinning by nanoparticles using simulations of the time-dependent Ginzburg-Landau model

et al. 2016

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Introducing nanoparticles into superconducting materials has emerged as an efficient route to enhance their current-carrying capability. We address the problem of optimizing vortex pinning landscape for randomly distributed metallic spherical inclusions using large-scale numerical simulations of time-dependent Ginzburg-Landau equations. We found the size and density of particles for which the highest critical current is realized in a fixed magnetic field. For each particle size and magnetic field, the critical current reaches a maximum value at a certain particle density, which typically corresponds to 15-23% of the total volume being replaced by nonsuperconducting material. For fixed diameter, this optimal particle density increases with the magnetic field. Moreover, we found that the optimal particle diameter slowly decreases with the magnetic field from 4.5 to 2.5 coherence lengths at a given temperature. This result shows that pinning landscapes have to be designed for specific applications taking into account relevant magnetic field scales.

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Enhancement of critical current density in YBa2Cu3O7 films using a semiconductor ion implanter

Cited by 24 publications

References 32 publications

Engineered Pinning Landscapes for Enhanced 2G Coil Wire

Engineered Pinning Landscapes for Enhanced 2G Coil Wire

Rapid doubling of the critical current of YBa2Cu3O7−δ coated conductors for viable high-speed industrial processing

Optimization of vortex pinning by nanoparticles using simulations of the time-dependent Ginzburg-Landau model

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