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Fluxoid pinning by vanadium carbide precipitates in superconducting vanadium

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Vanadium carbide precipitates were formed in pure, annealed vanadium foils by the introduction of carbon in the specimens. Thin, disk-shaped precipitates resulted with mean diameters in the range 100–2600 Å and with number densities from 3 × 1015 to 4 × 1017 particles/cm3. The macroscopic, pinning-force density for magnetic fluxoids was measured at temperatures from 2 to 5 K and for magnetic fields from 0 to H c2(T). Peak pinning-force densities in the range of 3 × 10 to 3 × 106 dyn/cm3 for T=0K were realized in the 30 specimens studied. The pinning force density was found to obey a scaling law for specimens meeting certain requirements with respect to precipitate particle size and number density. These requirements correlate with the temperature-dependent, superconducting coherence length ξ(T). Many specimens obeyed the scaling law at temperatures T < T c except near T c, where ξ(T) is large in comparison with the precipitate size.

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Author notes

  1. Roy L. Schuyler III

    Present address: E. I. duPont de Nemours and Co., Beaumont, Texas

Authors and Affiliations

  1. Department of Physics, Pennsylvania State University, University Park, Pennsylvania

    Alexander J. Marker III, Robert W. Reed & F. G. Brickwedde

  2. Metallurgical Section of the Department of Material Science, Pennsylvania State University, University Park, Pennsylvania

    Roy L. Schuyler III & William R. Bitler

Authors
  1. Alexander J. Marker III
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  2. Robert W. Reed
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  3. F. G. Brickwedde
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  4. Roy L. Schuyler III
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  5. William R. Bitler
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Additional information

Part of this work was supported by the Applied Research Laboratory of The Pennsylvania State University, under contract with the U.S. Naval Sea Systems Command.

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Marker, A.J., Reed, R.W., Brickwedde, F.G. et al. Fluxoid pinning by vanadium carbide precipitates in superconducting vanadium. J Low Temp Phys 31, 175–192 (1978). https://doi.org/10.1007/BF00116236

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  • DOI: https://doi.org/10.1007/BF00116236

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