Flux pinning in Bi-2212/Ag-based wires and coils

Fabbricatore, P.; Priano, C.; Sciutti, A.; Gemme, G.; Musenich, R.; Parodi, R.; Gömöry, Fedor; Thompson, J.R.

doi:10.1103/physrevb.54.12543

Cited by 38 publications

(21 citation statements)

References 28 publications

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“…5), which is similar to the H c2 (T ) dependency of many HTSc [46,47]. The temperature dependence of H irr /H c2 is qualitatively described by the equations given by Fabbricatore et al [41]. An accurate calculation of H c2 (T )/H irr (T ) requires more information about the H c2 (T ) and the coherence length ξ (T ) dependencies.…”

Section: Discussionmentioning

confidence: 55%

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Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Zeng

Karwoth

Koblischka

et al. 2017

Phys. Rev. Materials

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Networks of superconducting Bi 2 Sr 2 CaCu 2 O 8 (Bi-2212) nanowires were fabricated by the electrospinning technique. The nanowires have a diameter of the order of 150-200 nm and lengths up to the micrometer range and form a nonwoven, fabric-like network with numerous interconnections enabling a current flow between the nanowires. The porosity of this nanowire network is 0.9928. Therefore, this material represents a novel class of ultraporous high-temperature superconductors. The magnetizations of the nanowire networks [M(T ) and M(H )] were recorded by SQUID magnetometry. The magnetic properties were analyzed using the extended critical state model (ECSM). It is supposed that the averaged diameter of the nanowires rules the magnetic field dependence of the critical current density of the nanowire network. Single nanowires have remarkably high values of the critical current density of 1.04 × 10 7 A/cm 2 at 5 K. The macroscopic critical current density less than ∼0.05 A/cm

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Section: Discussionmentioning

confidence: 55%

“…7). These values differ from the Kramer parameters (p = 0.5, q = 2), but they are typical for anisotropic and polycrystalline superconductors [41,42]. …”

Section: Estimations Of J C and F Pmentioning

confidence: 93%

Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Zeng

Karwoth

Koblischka

et al. 2017

Phys. Rev. Materials

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“…In general, any determination of the parameters p and q from scaling laws is more significant than that obtained only from measurements of the irreversibility line. 32 Generally speaking, it is not trivial to analyze the F p plots for the actually acting pinning mechanism. To describe the pinning in HTS, it has been assumed that core pinning is dominant due to the large Ginzburg-Landau parameter (j) values.…”

Section: Displayed Inmentioning

confidence: 99%

Temperature- and field-dependent critical currents in [(Bi,Pb)2Sr2Ca2Cu3Ox]0.07(La0.7Sr0.3MnO3)0.03 thick films grown on LaAlO3 substrates

Paredes

Morán

Baca

2013

Journal of Applied Physics

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La0.7Sr0.3MnO3 (LSMO) nanoparticles were embedded in (Bi,Pb)2Sr2Ca2Cu3Ox (Bi2223) thick films, which were grown by simple melting-quenching-annealing (MQA) method on (001)-oriented LaAlO3 (LAO) substrates. The nominal composition of the composite-like hybrid system was (Bi2223)1−x(LSMO)x with x = 0.03. The constituent elements, Bi2223 and LSMO, were prepared separately by standard solid state reaction and Pechini's method, respectively. The analysis of the X-ray diffraction patterns suggested a polycrystalline growth mode of the thick films on the LAO substrates. From electric transport measurements, the superconducting onset temperature and the superconducting critical temperature (ρ = 0) ended up being 105 and 62 K, respectively. The flux pinning energy U was determined using the Anderson-Kim model. The value of U was compared with those obtained for similar samples with concentrations x = 0.01 and x = 0.05. Current-voltage characteristics were recorded at different temperatures in order to analyze the behavior of the superconducting current (Ic) of the films. A dramatic drop of Ic was observed at ∼20 K. This seems to be linked to the presence of flux creep acting as dissipation factors attributed to LSMO nanoparticles. Isothermal magnetization loops recorded at T < Tc and T > Tc showed clear diamagnetic and ferromagnetic signals, which verify the multifunctional character of the system. Based on the isothermal M(H)-loops recorded at 5, 20, and 40 K and taking Kim's model into account, the dependence of superconducting current density (Jc), and the volume pinning force (Fp) on the magnetic field were calculated. The dependence Jc(B) at 5 K showed an exponential-type behavior, which is described by an empirical equation. This empirical equation considers the maximum value of Fp, which may be scaled with the Kramer's expression for Fp. From this scaling procedure, diverse exponents, associated with different pinning mechanisms, were determined. The drastic fall of Jc(B) at T > 20 K is discussed by considering the decreasing of the lower critical field (Hc1), penetration field (Hp), irreversible magnetic field (Hirr), and magnetization maximum (Mmax) with increasing in the LSMO particle content.

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“…Yeshurun and Malozemoff 31 found on YBCO single crystals measured in the high temperature range mϭ3/2, which is very similar to our measurements. The temperature dependence of H irr (T) was calculated by Fabbricatore et al 32 for different interaction volumes d 3 or d 2 , and allowing different types of pinning. Also in this description the flattening of the IL of the single crystal cannot be explained.…”

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confidence: 99%

Scaling of pinning forces in NdBa2Cu3O7−δ superconductors

Koblischka

Higuchi

Yoo

et al. 1999

Journal of Applied Physics

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Articles you may be interested inColumnar tilt and vortex stress in superconducting thin films of Nd Ba 2 Cu 3 O 7 − δ : Magnetization critical current-density measurementsThe scaling of the volume pinning forces, F p ϭ j c ϫB a , is performed versus the reduced fields b f ϭB a /B fp ͑where B a is the applied field, and B fp denotes the peak position of F p,max ) and h ϭH a /H irr ͑where H irr denotes the irreversibility field͒ for two different NdBa 2 Cu 3 O 7Ϫ␦ superconductors, a single crystal and a melt-processed sample. In both cases, an excellent natural scaling is found to hold. Based on these good scaling results, we extend the scaling analysis towards lower temperatures. There, the scaling parameters are no longer directly accessible within our experimental field range, but can be deduced from the F p (B a ) curves normalized using fitting values of B fp and F p,max so that these overlap with the high temperature curves. It is shown that such a procedure allows to obtain reasonably good estimates of F p,max and H irr , which leads in turn to an estimation of the irreversibility line well down to 0 temperature. At low temperatures, deviations from the analytical dependencies appear which are due to interference with the central and intermediate peak in the magnetization loops. The shape of the irreversibility line is discussed.

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Flux pinning in Bi-2212/Ag-based wires and coils

Cited by 38 publications

References 28 publications

Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Temperature- and field-dependent critical currents in [(Bi,Pb)2Sr2Ca2Cu3Ox]0.07(La0.7Sr0.3MnO3)0.03 thick films grown on LaAlO3 substrates

Scaling of pinning forces in NdBa2Cu3O7−δ superconductors

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