Czechoslovak Journal of Physics B

, Volume 36, Issue 4, pp 524–536 | Cite as

Properties of superfine superconducting filaments embedded in normal matrix

  • S. Takács


The size-, surface- and proximity-effects are combined for calculating the critical temperature and some unusual electromagnetic properties of superfine superconducting NbTi filaments (i.e. with a diameterds < 0·1 μm) in the neighbourhood of normal metal (Cu). It is shown that the existence of the one-dimensional flux line lattice is responsible for the extremely large values of the critical current densities in low magnetic fields (B < 0·2Bc2,Bc2 — the upper critical magnetic field), for the maximum of the volume pinning force at low magnetic fields (Bm ≈ 0·1Bc2, comparing withBm≈ 0·5Bc2 in usual macroscopic multifilamentary NbTi superconductors), as well as for the peculiar minimum of the magnetization after reversing the magnetic field direction. The possible role of the frozen-in flux lines in creating flux lines of opposite direction is sketched. It is proposed that for practical purposes the superconducting filaments should be coated with electrically insulating material (e.g. cupro-nickel or dielectric) to destroy the electro-magnetic coupling between the filaments and to ensure low ac losses in the composite.


Magnetic Field Critical Temperature Practical Purpose Line Lattice Critical Current Density 
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Copyright information

© Academia, Publishing House of the Czechoslovak Academy of Sciences 1986

Authors and Affiliations

  • S. Takács
    • 1
  1. 1.Electrotechnical Institute, Electro-Physical Research CentreSlovak Acad. Sci.BratislavaCzechoslovakia

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