Doping-induced enhancement of grain boundary critical currents

G. Hammerl, H. Bielefeldt, B. Goetz, A. Schmehl, C.W. Schneider, R.R. Schulz, H. Hilgenkamp, J. Mannhart

    Research output: Contribution to journalArticleAcademicpeer-review

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    Abstract

    The critical-current density of grain boundaries in high-Tc superconductors was enhanced to values exceeding the previously known limits both at 4.2 K and at 77 K. Noting the importance of space-charge layers and of the dx2-y2-wave pairing symmetry on grain-boundary transport, we have established a model that provides a comprehensive description of the grain boundaries and proposes ways for their improvement, such as overdoping of the grains and of their boundaries. Exploring as example the effects of overdoping of YBa2Cu3O7-δ with Ca, we enhanced significantly the critical current densities and decreased the normal-state resistivities of grain boundaries to unprecedented values. By introducing doping heterostructures to overdope grain boundaries selectively over a few nanometers by benefiting from grain boundary diffusion, the enhancement of the critical-current density is achieved at all temperatures up to Tc. At 77 K, critical current densities are obtained which before had been found only at 4.2 K. This concept is proposed as a practical and cost-effective route to enhance the performance of high-Tc coated conductors fabricated by ion beam assisted deposition (IBAD) or by the rolling assisted biaxially aligned substrate process (RABITS).
    Original languageEnglish
    Pages (from-to)2830-2837
    Number of pages8
    JournalIEEE transactions on applied superconductivity
    Volume11
    Issue number1
    DOIs
    Publication statusPublished - 2001

    Fingerprint

    Critical currents
    critical current
    Grain boundaries
    grain boundaries
    Doping (additives)
    augmentation
    current density
    Critical current density (superconductivity)
    Ion beam assisted deposition
    Crystal symmetry
    Electric space charge
    Superconducting materials
    Heterojunctions
    space charge
    conductors
    ion beams
    routes
    costs
    electrical resistivity
    symmetry

    Cite this

    Hammerl, G., Bielefeldt, H., Goetz, B., Schmehl, A., Schneider, C. W., Schulz, R. R., ... Mannhart, J. (2001). Doping-induced enhancement of grain boundary critical currents. IEEE transactions on applied superconductivity, 11(1), 2830-2837. https://doi.org/10.1109/77.919652
    Hammerl, G. ; Bielefeldt, H. ; Goetz, B. ; Schmehl, A. ; Schneider, C.W. ; Schulz, R.R. ; Hilgenkamp, H. ; Mannhart, J. / Doping-induced enhancement of grain boundary critical currents. In: IEEE transactions on applied superconductivity. 2001 ; Vol. 11, No. 1. pp. 2830-2837.
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    abstract = "The critical-current density of grain boundaries in high-Tc superconductors was enhanced to values exceeding the previously known limits both at 4.2 K and at 77 K. Noting the importance of space-charge layers and of the dx2-y2-wave pairing symmetry on grain-boundary transport, we have established a model that provides a comprehensive description of the grain boundaries and proposes ways for their improvement, such as overdoping of the grains and of their boundaries. Exploring as example the effects of overdoping of YBa2Cu3O7-δ with Ca, we enhanced significantly the critical current densities and decreased the normal-state resistivities of grain boundaries to unprecedented values. By introducing doping heterostructures to overdope grain boundaries selectively over a few nanometers by benefiting from grain boundary diffusion, the enhancement of the critical-current density is achieved at all temperatures up to Tc. At 77 K, critical current densities are obtained which before had been found only at 4.2 K. This concept is proposed as a practical and cost-effective route to enhance the performance of high-Tc coated conductors fabricated by ion beam assisted deposition (IBAD) or by the rolling assisted biaxially aligned substrate process (RABITS).",
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    Hammerl, G, Bielefeldt, H, Goetz, B, Schmehl, A, Schneider, CW, Schulz, RR, Hilgenkamp, H & Mannhart, J 2001, 'Doping-induced enhancement of grain boundary critical currents', IEEE transactions on applied superconductivity, vol. 11, no. 1, pp. 2830-2837. https://doi.org/10.1109/77.919652

    Doping-induced enhancement of grain boundary critical currents. / Hammerl, G.; Bielefeldt, H.; Goetz, B.; Schmehl, A.; Schneider, C.W.; Schulz, R.R.; Hilgenkamp, H.; Mannhart, J.

    In: IEEE transactions on applied superconductivity, Vol. 11, No. 1, 2001, p. 2830-2837.

    Research output: Contribution to journalArticleAcademicpeer-review

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    AU - Hammerl, G.

    AU - Bielefeldt, H.

    AU - Goetz, B.

    AU - Schmehl, A.

    AU - Schneider, C.W.

    AU - Schulz, R.R.

    AU - Hilgenkamp, H.

    AU - Mannhart, J.

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    AB - The critical-current density of grain boundaries in high-Tc superconductors was enhanced to values exceeding the previously known limits both at 4.2 K and at 77 K. Noting the importance of space-charge layers and of the dx2-y2-wave pairing symmetry on grain-boundary transport, we have established a model that provides a comprehensive description of the grain boundaries and proposes ways for their improvement, such as overdoping of the grains and of their boundaries. Exploring as example the effects of overdoping of YBa2Cu3O7-δ with Ca, we enhanced significantly the critical current densities and decreased the normal-state resistivities of grain boundaries to unprecedented values. By introducing doping heterostructures to overdope grain boundaries selectively over a few nanometers by benefiting from grain boundary diffusion, the enhancement of the critical-current density is achieved at all temperatures up to Tc. At 77 K, critical current densities are obtained which before had been found only at 4.2 K. This concept is proposed as a practical and cost-effective route to enhance the performance of high-Tc coated conductors fabricated by ion beam assisted deposition (IBAD) or by the rolling assisted biaxially aligned substrate process (RABITS).

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    Hammerl G, Bielefeldt H, Goetz B, Schmehl A, Schneider CW, Schulz RR et al. Doping-induced enhancement of grain boundary critical currents. IEEE transactions on applied superconductivity. 2001;11(1):2830-2837. https://doi.org/10.1109/77.919652