Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries

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

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    227 Citations (Scopus)

    Abstract

    With the discovery of high-temperature superconductivity, it seemed that the vision of superconducting power cables operating at the boiling point of liquid nitrogen (77 K) was close to realization. But it was soon found that the critical current density Jc of the supercurrents that can pass through these polycrystalline materials without destroying superconductivity is remarkably small. In many materials, Jc is suppressed at grain boundaries, by phenomena such as interface charging and bending of the electronic band structure. Partial replacement (‘doping’) of the yttrium in YBa2Cu3O7-δ with calcium has been used to increase grain-boundary Jc values substantially, but only at temperatures much lower than 77 K (ref. 9). Here we show that preferentially overdoping the grain boundaries, relative to the grains themselves, yields values of Jc at 77 K that far exceed previously published values. Our results indicate that grain-boundary doping is a viable approach for producing a practical, cost-effective superconducting power cable operating at liquid-nitrogen temperatures.
    Original languageEnglish
    Pages (from-to)162-164
    Number of pages3
    JournalNature
    Volume407
    DOIs
    Publication statusPublished - 2000

    Fingerprint

    calcium
    grain boundaries
    liquid nitrogen
    cables
    superconductivity
    yttrium
    boiling
    charging
    critical current
    current density
    costs
    electronics
    temperature

    Cite this

    Hammerl, G., Schmehl, A., Schulz, R. R., Goetz, B., Bielefeldt, H., Schneider, C. W., ... Mannhart, J. (2000). Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries. Nature, 407, 162-164. https://doi.org/10.1038/35025014
    Hammerl, G. ; Schmehl, A. ; Schulz, R.R. ; Goetz, B. ; Bielefeldt, H. ; Schneider, C.W. ; Hilgenkamp, H. ; Mannhart, J. / Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries. In: Nature. 2000 ; Vol. 407. pp. 162-164.
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    title = "Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries",
    abstract = "With the discovery of high-temperature superconductivity, it seemed that the vision of superconducting power cables operating at the boiling point of liquid nitrogen (77 K) was close to realization. But it was soon found that the critical current density Jc of the supercurrents that can pass through these polycrystalline materials without destroying superconductivity is remarkably small. In many materials, Jc is suppressed at grain boundaries, by phenomena such as interface charging and bending of the electronic band structure. Partial replacement (‘doping’) of the yttrium in YBa2Cu3O7-δ with calcium has been used to increase grain-boundary Jc values substantially, but only at temperatures much lower than 77 K (ref. 9). Here we show that preferentially overdoping the grain boundaries, relative to the grains themselves, yields values of Jc at 77 K that far exceed previously published values. Our results indicate that grain-boundary doping is a viable approach for producing a practical, cost-effective superconducting power cable operating at liquid-nitrogen temperatures.",
    author = "G. Hammerl and A. Schmehl and R.R. Schulz and B. Goetz and H. Bielefeldt and C.W. Schneider and H. Hilgenkamp and J. Mannhart",
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    doi = "10.1038/35025014",
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    Hammerl, G, Schmehl, A, Schulz, RR, Goetz, B, Bielefeldt, H, Schneider, CW, Hilgenkamp, H & Mannhart, J 2000, 'Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries', Nature, vol. 407, pp. 162-164. https://doi.org/10.1038/35025014

    Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries. / Hammerl, G.; Schmehl, A.; Schulz, R.R.; Goetz, B.; Bielefeldt, H.; Schneider, C.W.; Hilgenkamp, H.; Mannhart, J.

    In: Nature, Vol. 407, 2000, p. 162-164.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries

    AU - Hammerl, G.

    AU - Schmehl, A.

    AU - Schulz, R.R.

    AU - Goetz, B.

    AU - Bielefeldt, H.

    AU - Schneider, C.W.

    AU - Hilgenkamp, H.

    AU - Mannhart, J.

    PY - 2000

    Y1 - 2000

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    AB - With the discovery of high-temperature superconductivity, it seemed that the vision of superconducting power cables operating at the boiling point of liquid nitrogen (77 K) was close to realization. But it was soon found that the critical current density Jc of the supercurrents that can pass through these polycrystalline materials without destroying superconductivity is remarkably small. In many materials, Jc is suppressed at grain boundaries, by phenomena such as interface charging and bending of the electronic band structure. Partial replacement (‘doping’) of the yttrium in YBa2Cu3O7-δ with calcium has been used to increase grain-boundary Jc values substantially, but only at temperatures much lower than 77 K (ref. 9). Here we show that preferentially overdoping the grain boundaries, relative to the grains themselves, yields values of Jc at 77 K that far exceed previously published values. Our results indicate that grain-boundary doping is a viable approach for producing a practical, cost-effective superconducting power cable operating at liquid-nitrogen temperatures.

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