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Demagnetization effects upon the lower critical field of an anisotropic type II superconductor of ellipsoidal shape

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Abstract

The demagnetization factors for a material with an arbitrary permeability tensor Μ and with general ellipsoidal shape are found. These demagnetization factors are used to relate the bulk lower critical field H c1 in anisotropic superconductors to the angles of the external applied field. It is found that the anomalies in the angular dependence of H c1 predicted by Klemm and Clem for highly anisotropic bulk superconductors are also present for materials of highly aspherical shape. The special cases of highly oblate and prolate spheroids, corresponding to the layered and filamentary superconductors, are considered in detail.

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Authors and Affiliations

  1. Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada

    R. A. Klemm

  2. Ames Laboratory—USDOE and Department of Physics, Iowa State University, Ames, Iowa

    R. A. Klemm

Authors
  1. R. A. Klemm
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Klemm, R.A. Demagnetization effects upon the lower critical field of an anisotropic type II superconductor of ellipsoidal shape. J Low Temp Phys 39, 589–601 (1980). https://doi.org/10.1007/BF00114896

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  • DOI: https://doi.org/10.1007/BF00114896

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