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Susceptibility measurements on a system superconducting NbC grains near the percolation threshold

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  • McLachlan, D.S.
  • Oblakova, I.I.
  • Pakhomov, A.B.

Abstract

Measurements of χ′ and χ″ have been made at 36.7 Hz, using two dual phase lock-in amplifiers, on a series of NbC-KCl composites. The measurements are made, between 4.5 and 12 K, as a function of φ (the volume fraction of the 1–3 μm NbC grains) between 0.0 and 0.40, and in AC fields between 0.0005 and 1.8 Oe. The φ = 0.32 samples has a χ′ of -0.97, at 4.5 K, in low AC fields, when compared to a lead sample (χ = -1.0) of the same dimensions. The samples, in the region of the rapid decrease of χ′, i.e., close to the percolation threshold, display χ′ and χ″ versus T curves which have features very similar to those of granular high Tc superconductors. The strongly current-dependent features are almost certainly due to weak link point contacts forming between the hard angular NbC grains.

Suggested Citation

  • McLachlan, D.S. & Oblakova, I.I. & Pakhomov, A.B., 1994. "Susceptibility measurements on a system superconducting NbC grains near the percolation threshold," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 207(1), pages 245-248.
    • Handle: RePEc:eee:phsmap:v:207:y:1994:i:1:p:245-248
    DOI: 10.1016/0378-4371(94)90380-8
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    References listed on IDEAS

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    1. Takeda, E. & Cogger, K. O. & Yu, P. L., 1987. "Estimating criterion weights using eigenvectors: A comparative study," European Journal of Operational Research, Elsevier, vol. 29(3), pages 360-369, June.
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