Strain-Driven Oxygen Deficiency in Self-Assembled, Nanostructured, Composite Oxide Films

Cantoni, Claudia; Gao, Yanfei; Wee, Sung Hun; Specht, E. D.; Gàzquez, Jaume; Meng, Jianyong; Pennycook, Stephen J.; Goyal, A.

doi:10.1021/nn2007628

Cited by 125 publications

(109 citation statements)

References 26 publications

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“…Llordés et al proposed that the core pinning from strain-induced Cooper pair suppression dominates J c in MOD REBCO thin films, and this mechanism explains well the observed pinning enhancement at 77 K. 34 In PLD thin films, by atomic-resolution Z-contrast imaging and electron energy loss spectroscopy, Cantoni et al showed that the local strain between BZO nanorods and YBCO induces oxygen deficiencies surrounding BZO nanorods, and this is related to the observed T c reduction. 35 Distinct from MOD and PLD films, in our MOCVD samples, our work has shown that the point defects, acting as weak uncorrelated pinning, are effective pins only at low temperatures below ∼30 K, 12 and no T c reduction was observed. REBCO exhibits extremely high flexibility to pinning defects.…”

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confidence: 65%

Strongly enhanced vortex pinning from 4 to 77 K in magnetic fields up to 31 T in 15 mol.% Zr-added (Gd, Y)-Ba-Cu-O superconducting tapes

et al. 2014

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Applications of REBCO coated conductors are now being developed for a very wide range of temperatures and magnetic fields and it is not yet clear whether vortex pinning strategies aimed for high temperature, low field operation are equally valid at lower temperatures and higher fields. A detailed characterization of the superconducting properties of a 15 mol. % Zr-added REBCO thin film made by metal organic chemical vapor deposition, from 4.2 to 77 K under magnetic fields up to 31 T is presented in this article. Even at a such high level of Zr addition, Tc depression has been avoided (Tc = 91 K), while at the same time an exceptionally high irreversibility field Hirr ≈ 14.8 T at 77 K and a remarkably high vortex pinning force density Fp ≈ 1.7 TN/m3 at 4.2 K have been achieved. We ascribe the excellent pinning performance at high temperatures to the high density (equivalent vortex matching field ∼7 T) of self-assembled BZO nanorods, while the low temperature pinning force is enhanced by large additional pinning which we ascribe to strain-induced point defects induced in the REBCO matrix by the BZO nanorods. Our results suggest even more room for further performance enhancement of commercial REBCO coated conductors and point the way to REBCO coil applications at liquid nitrogen temperatures since the critical current density Jc(H//c) characteristic at 77 K are now almost identical to those of fully optimized Nb-Ti at 4 K.

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confidence: 65%

Strongly enhanced vortex pinning from 4 to 77 K in magnetic fields up to 31 T in 15 mol.% Zr-added (Gd, Y)-Ba-Cu-O superconducting tapes

et al. 2014

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“…The trends of the c-axis expansion and T c decrease in PLD films are consistent with oxygen-deficient regions surrounding the inclusions. 39 Highresolution plan-view images and geometrical phase analysis (Figures 3d and e) show the strain induced by PLD-NRs and MOD-NPs in the matrix. The strain component maps show that tensile and compressive stain are localized around the coherent NR interfaces and extend for more than 10 nm that has been observed in other PLD-BZO-NRs films.…”

Section: Resultsmentioning

confidence: 99%

“…The strain component maps show that tensile and compressive stain are localized around the coherent NR interfaces and extend for more than 10 nm that has been observed in other PLD-BZO-NRs films. 39,40 The 410 nm extended strain region should lead to NRs overlapping at low dopant vol.% with a corresponding disruption of current percolation and lower T c and J c s.f. .…”

Section: Resultsmentioning

confidence: 99%

Tuning nanoparticle size for enhanced functionality in perovskite thin films deposited by metal organic deposition

et al. 2017

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Because of pressing global environmental challenges, focus has been placed on materials for efficient energy use, and this has triggered the search for nanostructural modification methods to improve performance. Achieving a high density of tunable-sized second-phase nanoparticles while ensuring the matrix remains intact is a long-sought goal. In this paper, we present an effective, scalable method to achieve this goal using metal organic deposition in a perovskite system REBa 2 Cu 3 O 7 (rare earth (RE)) that enhances the superconducting properties to surpass that of previous achievements. We present two industrially compatible routes to tune the nanoparticle size by controlling diffusion during the nanoparticle formation stage by selecting the second-phase material and modulating the precursor composition spatially. Combining these routes leads to an extremely high density (8 × 10 22 m − 3 ) of small nanoparticles (7 nm) that increase critical currents and reduce detrimental effects of thermal fluctuations at all magnetic field strengths and temperatures. This method can be directly applied to other perovskite materials where nanoparticle addition is beneficial.

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“…However, high BZO concentrations often are detrimental to T c . 5 Usually, MOCVD and metal organic deposited (MOD) coated conductors contain multiple pins. Such complex microstructures are valuable for raising J c for broad temperature and field applications, but their very complexity makes understanding their pinning effects non-trivial.…”

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confidence: 99%

Broad temperature range study of Jc and Hirr anisotropy in YBa2Cu3Ox thin films containing either Y2O3 nanoparticles or stacking faults

Jaroszyński

Kametani

et al. 2015

Applied Physics Letters

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Industrially optimized coated conductors generate very high current densities Jc and irreversibility field Hirr by quasi-empirical additions of multiple pin types. However, their microstructural complexity makes it hard to securely explain all aspects of their properties. We here describe the properties of two specially grown pulsed laser deposited YBa2Cu3Ox thin films with simpler pinning landscapes, for which we conducted detailed Jc(T, H, θ) and Hirr(T, H, θ) characterizations from 10 K to Tc, and in magnetic fields up to 31 T. One film has a random insulating Y2O3 nanoparticle distribution, while the second was grown with many ab-plane stacking faults. As a whole, the Y2O3-containing sample shows significantly higher Jc(θ) at all temperatures, except around the ab-plane at greater than 40 K. Consistent with our earlier studies of the effect of BaZrO3 (BZO) nanorods in commercial coated conductors, we find that there is significant additional Jc at low temperatures when insulating precipitates with strain mismatch are present that we attribute to point defect pinning that can resist thermal fluctuations only below about 30 K. In addition to this significantly enhanced low temperature Jc, the Y2O3-containing thin film also exhibits significantly reduced effective Ginzburg-Landau (G-L) anisotropy parameter fits for Hirr(θ), which fall to γeff ≈ 3.6 from the more usual γeff ≈ 5 in the stacking-fault containing thin film. Of significant practical importance is our finding that the Y2O3 containing film achieved a bulk flux pinning force density Fp of 1000 GN/m3 at 16 T and 4.2 K, a value about 30% larger than the mixed BZO-RE2O3 pin coated conductors which are presently the state of the art.

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Strain-Driven Oxygen Deficiency in Self-Assembled, Nanostructured, Composite Oxide Films

Cited by 125 publications

References 26 publications

Strongly enhanced vortex pinning from 4 to 77 K in magnetic fields up to 31 T in 15 mol.% Zr-added (Gd, Y)-Ba-Cu-O superconducting tapes

Strongly enhanced vortex pinning from 4 to 77 K in magnetic fields up to 31 T in 15 mol.% Zr-added (Gd, Y)-Ba-Cu-O superconducting tapes

Tuning nanoparticle size for enhanced functionality in perovskite thin films deposited by metal organic deposition

Broad temperature range study of Jc and Hirr anisotropy in YBa2Cu3Ox thin films containing either Y2O3 nanoparticles or stacking faults

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