Upward shift of the vortex solid phase in high-temperature-superconducting wires through high density nanoparticle addition

Miura, Masashi; Maiorov, B.; Balakirev, Fedor; Kato, Takumi; Sato, Michio; Takagi, Yuji; Izumi, Teruo; Civale, L.

doi:10.1038/srep20436

Cited by 38 publications

(32 citation statements)

References 36 publications

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“…Recently, the anisotropy of MOD-prepared YGdBaCuO films with BZO has been discussed 15 : here again, the addition of NPs did not affect the intrinsic anisotropy (γ=5.0). However, different from other reported MOD-grown YBCO with BZO NPs 6,16 , a reduction of the effective anisotropy was not observed, a result explained by the presence of a higher density of twin boundaries.…”

Section: Introductionmentioning

confidence: 62%

Intrinsic anisotropy versus effective pinning anisotropy in YBa2Cu3O7 thin films and nanocomposites

et al. 2019

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The intrinsic and effective anisotropies, both in the liquid and solid vortex regimes, of YBa 2 Cu 3 O 7 pristine and nanocomposite thin-films have been investigated. Angular resistivity measurements under varying fields and temperatures were performed to characterize the intrinsic vs. effective anisotropy of samples in the regime of longrange vortex displacements. The effective anisotropy γ eff was determined from the scaling of the irreversibility line, applying Blatter approach developed for uniaxial anisotropic superconductors. Resistive measurements in flux-flow were utilized, in addition to H c2 measurements in ultra-high-fields, to determine the intrinsic anisotropy mass γ, enabling the study of a large number of samples with varied nanoparticle compositions. In order to access the intrinsic anisotropy in the vortex solid phase, complex impedance measurements at high microwave frequencies were performed, allowing us to access the flux-flow intrinsic anisotropy in the regime of very-short vortex oscillations within the pinning potential wells. Results show that while the effective anisotropy γ eff decays as the nanoparticlesinduced nanostrain in the YBCO films increases, the intrinsic anisotropy γ (determined both in dc and at microwave frequency) remains unaltered.

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Section: Introductionmentioning

confidence: 62%

Intrinsic anisotropy versus effective pinning anisotropy in YBa2Cu3O7 thin films and nanocomposites

et al. 2019

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“…The deviation is associated with the NP contribution and could be associated with only using the average value of the NP size rather than the actual size distribution and because of the fact that the pinning landscape changes slightly after adding NPs. 26 The most important feature of the present model is that all the parameters used are derived by fitting to a limited set of experimental data (no free parameters) and that temperature, angle and field properties at other experimental conditions are then calculated.…”

Section: Dramatically Higher J C With Nearly Isotropic Angular Dependmentioning

confidence: 99%

“…[17][18][19] Until now, such a large amount of second phase resulted in current blocking and the loss of crystallinity. 19,20 For REBCO superconductors, MOD has been shown to be amenable for growing extremely high performance materials [21][22][23][24][25][26] with high throughput; [27][28][29] however, the tailoring of NP inclusions is extremely difficult. 30 Unlike PLD, the formation of NPs during MOD occurs before matrix formation; therefore, the NP size is not determined by crystalline strain but by diffusion, leaving little room for tailoring particle size compared with that of in situ processes, where growth dynamics affect the nanoparticle/nanorod morphology.…”

Section: Introductionmentioning

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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“…In the field range between

and

, the thermal fluctuations become important, and the superconducting state loses its zero-resistance behaviour. In type II superconductors, high-field and -current applications are limited by the irreversibility line

; for example, values of

at low temperatures from 50% to ∼80% of the

have been observed in MgB 2 and up to 85% in (Y 0.77 ,Gd 0.23 )Ba 2 Cu 3 O y films [ 45 , 46 ]. In our sample, the irreversibility field was 70% of the upper critical field at low temperatures, and dropped to less than 20% of

close to the critical temperature

.…”

Section: Resultsmentioning

confidence: 99%

Transport and Point Contact Measurements on Pr1−xCexPt4Ge12 Superconducting Polycrystals

et al. 2020

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We performed a detailed investigation of the superconducting properties of polycrystalline Pr1−xCexPt4Ge12 pellets. We report the effect of Ce substitution, for x = 0.07, on magnetic field phase diagram H-T. We demonstrate that the upper critical field is well described by the Ginzburg–Landau model and that the irreversibility field line has a scaling behaviour similar to cuprates. We also show that for magnetic fields lower than 0.4 T, the activation energy follows a power law of the type ?−1/2, suggesting a collective pinning regime with a quasi-2D character for the Ce-doped compound with x = 0.07. Furthermore, by means of a point contact Andreev reflection spectroscopy setup, we formed metal/superconductor nano-junctions as small as tens of nanometers on the PrPt4Ge12 parent compound (x = 0). Experimental results showed a wide variety of conductance features appearing in the dI/dV vs. V spectra, all explained in terms of a modified Blonder–Tinkham–Klapwijk model considering a superconducting order parameter with nodal directions as well as sign change in the momentum space for the sample with x = 0. The numerical simulations of the conductance spectra also demonstrate that s-wave pairing and anisotropic s-waves are unsuitable for reproducing experimental data obtained at low temperature on the un-doped compound. Interestingly, we show that the polycrystalline nature of the superconducting PrPt4Ge12 sample can favour the formation of an inter-grain Josephson junction in series with the point contact junction in this kind of experiments.

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Upward shift of the vortex solid phase in high-temperature-superconducting wires through high density nanoparticle addition

Cited by 38 publications

References 36 publications

Intrinsic anisotropy versus effective pinning anisotropy in YBa2Cu3O7 thin films and nanocomposites

Intrinsic anisotropy versus effective pinning anisotropy in YBa2Cu3O7 thin films and nanocomposites

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

Transport and Point Contact Measurements on Pr1−xCexPt4Ge12 Superconducting Polycrystals

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