Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

Miura, Masashi; Maiorov, B.; Kato, Takumi; Shimode, Takashi; Wada, Keisuke; Adachi, Seiji; Tanabe, K.

doi:10.1038/ncomms3499

Cited by 85 publications

(95 citation statements)

References 38 publications

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“…The new data fit extremely well with the μ 0 H(ΔJ c,max )~n~1 /2 universal dependence 44 we found for the cuprates and pnictides with NPs, indicating that the maximum effects are obtained when a f~LNP . This condition (a f~LNP ) is also manifested in the flux creep rate.…”

Section: Dramatically Higher J C With Nearly Isotropic Angular Dependsupporting

confidence: 66%

“…44 The +12BHO (d coat = 30 nm) film shows a maximum J c ratio (ΔJ c,max ) of 6.5 near μ 0 H(ΔJ c,max )~3.5 T. The field values are extremely close to μ 0 H NP, the field at which the intervortex distance (a f ) matches L NP (~20 nm).…”

Section: Dramatically Higher J C With Nearly Isotropic Angular Dependmentioning

confidence: 90%

“…For BZO (D NP~2 5 nm), D NP /2ξ ab is 1.5 at 80 K but 44 at low temperatures, whereas for BHO (D NP~7 nm), d/2ξ ab ⩽ 1 and~2 at high and low temperatures, respectively. Values of d/2ξ ab 43 or o o1 lead to less effective pinning; 44 thus, the ability of the 7-nm BHO NPs to increase J c is higher and is restrained to lower temperatures.…”

Section: Dramatically Higher J C With Nearly Isotropic Angular Dependmentioning

confidence: 99%

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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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Section: Dramatically Higher J C With Nearly Isotropic Angular Dependsupporting

confidence: 66%

Section: Dramatically Higher J C With Nearly Isotropic Angular Dependmentioning

confidence: 90%

Section: Dramatically Higher J C With Nearly Isotropic Angular Dependmentioning

confidence: 99%

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

et al. 2017

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“…3(a). [26][27][28][29][30][31][32] Moreover, at 9 T, J c H//c is 0.8 MA/cm 2 and the pinning force is 72 GN/m 3 .…”

Section: Junction Devicesmentioning

confidence: 99%

High critical-current density with less anisotropy in BaFe2(As,P)2 epitaxial thin films: Effect of intentionally grown c-axis vortex-pinning centers

Sato

Hiramatsu

Kamiya

et al. 2014

Applied Physics Letters

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We report herein a high and isotropic critical-current density J c for BaFe 2 (As,P) 2 epitaxial films. The isotropy of J c with respect to the magnetic-field direction was improved significantly by decreasing the film growth rate to 2.2 Å/s. The low growth rate served to preferentially align dislocations along the c-axis, which work well as c-axis vortex-pinning centers. Because of the intentional introduction of effective pinning, the absolute J c at 9 T was larger than that obtained for other iron-based superconductors and conventional alloy superconducting wires.

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“…1, 2 The reduction of the vortex mobility by a lattice of the pinning centers allows to damp the energy dissipation and substantially increase the critical current, 3-7 which is extremely important for application of superconductors in electronics. During the last decades it became possible to create both low-and high-temperature superconductors with various types of natural and artificial defects (holes, [8][9][10] grain boundaries, 11 nanorods, 12-14 imbedded nanoparticles, 15 surface grades, 16 controllable lattice transformations, 17 etc.) which are shown to be effective barriers for the vortex motion.…”

mentioning

confidence: 99%

Magnetic mapping of defects in type-II superconductors

Миронов

Devizorova

Clergerie

et al. 2016

Applied Physics Letters

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Recently it was discovered that the non-uniform Meissner current flowing around the pinning sites in the type-II superconductor induces the unconventional vortex-antivortex pairs with the non-quantized magnetic flux [J.-Y. Ge, J. Gutierrez, V. N. Gladilin, J. T. Devreese, and V. V. Moshchalkov, Nat. Commun. 6, 6573 (2015)]. Here we provide the theory of this phenomenon showing that the vortex-like structures originate from the perturbation of the current streamlines by the non-superconducting defect, which results in the generation of the localized magnetic field. The position and the shape of such vortex dipoles are shown to be very sensitive to the defect form. Thus, applying the external magnetic field or current to the superconductor and using, e.g., the high-resolution scanning Hall microscope to measure the stray magnetic field one can plot the map containing the information about the position of the defects and their shape.The control of the Abrikosov vortex pinning is one of the corner-stone problems in the physics of superconducting systems. 1,2 The reduction of the vortex mobility by a lattice of the pinning centers allows to damp the energy dissipation and substantially increase the critical current, 3-7 which is extremely important for application of superconductors in electronics. During the last decades it became possible to create both low-and high-temperature superconductors with various types of natural and artificial defects (holes, 8-10 grain boundaries, 11 nanorods, 12-14 imbedded nanoparticles, 15 surface grades, 16 controllable lattice transformations, 17 etc.) which are shown to be effective barriers for the vortex motion. The corresponding enhancement of the critical current appears to be very sensitive to the particular shape and the spatial distribution of the pinning centers. This aims the efforts of both theoreticians and experimentalists at the engineering of the efficient pinning potentials and the extensive study of the magnetic flux behavior simultaneously affected by the pinning sites and the transport current.Recently the magnetic field induced by the Meissner current flowing around the pinning sites was measured with the high-resolution scanning Hall microscope. 18,19 It was found that the magnetic contrast near the defects reminds the one for the pair of vortex and antivortex. Interestingly, the magnetic flux carried by each pole of such "vortex dipole" is not quantized and depends on current. To explain this effect the authors have performed sophisticated numerical simulations based on the time-dependent Ginzburg-Landau equation accounting the non-uniform profile of the Meissner current. Here we provide the simple explanation of this phenomenon within the stationary currents theory. It is based on the fact that each defect being impervious for the Cooper pairs perturbs the streamlines of the superconducting current which gives rise to the well-localized stray magnetic field. Our analysis clearly shows that the formation of the vortex dipoles is not specific to the Meissner s...

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Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

Cited by 85 publications

References 38 publications

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

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

High critical-current density with less anisotropy in BaFe2(As,P)2 epitaxial thin films: Effect of intentionally grown c-axis vortex-pinning centers

Magnetic mapping of defects in type-II superconductors

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