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Radiation-induced flux pinning in type II superconductors

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In monocyrstalline foils of oxygen-doped niobium and niobium—zirconium alloys, statistically distributed or regularly arranged voids were created during irradiation with high-energy 58Ni+ ions (3.5MeV, up to 8.1 × 1016 ions/cm2) at temperatures between 750 and 900°C. The voids exhibit a strong interaction with flux lines, which was determined from measurements of the (anisotropic) critical currents as a function of transverse magnetic field, temperature, and defect geometry. The experimentally determined volume pinning forces obey scaling laws and lead to elementary interaction forces between voids and fluxoids that are larger than theoretical values calculated for various possible mechanisms of interaction. The validity of the statistical summation of elementary forces is discussed.

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Authors and Affiliations

  1. Institut für Metallphysik and Sonderforschungsbereich, University of Göttingen, Germany

    Herbert C. Freyhardt

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  1. Herbert C. Freyhardt
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Research supported by the U.S. Energy Research and Development Administration, the Deutsche Forschungsgemeinschaft, and the Akademie der Wissenschaften in Göttingen. For numerical computations the facilities of the Gesellschaft für Wissenschaftliche Datenverarbeitung mbH Göttingen were used. This investigation is part of a Habilitation Thesis presented at the University of Göttingen.

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Freyhardt, H.C. Radiation-induced flux pinning in type II superconductors. J Low Temp Phys 32, 101–129 (1978). https://doi.org/10.1007/BF00116908

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