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Vortex chain size effect and negative resistance in pin-free superconducting films

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Abstract

We investigate the static and dynamic behavior of vortices in a pin-free superconductor. A diffraction pattern is observed in the critical currentJ cvs. applied fieldH ∥parallel to the surface of a granular Al film. When one vortex chain is formed in the film,J cbecomes nearly equal to zero, which verifies that the sample is actually pin-free. An interaction between a radiofrequency current and moving vortices occurs, and theI–V curve shows peculiar nonlinear effects such as “real negative resistance.” The results are analogous to dc and ac Josephson effects.

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Authors and Affiliations

  1. Research Institute of Electrical Communication, Tohoku University, Sendai, Japan

    T. Yamashita & Y. Onodera

  2. Institut de Physique Expérimentale, Université de Lausanne, Lausanne-Dorigny, Switzerland

    L. Rinderer

Authors
  1. T. Yamashita
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  2. Y. Onodera
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  3. L. Rinderer
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Yamashita, T., Onodera, Y. & Rinderer, L. Vortex chain size effect and negative resistance in pin-free superconducting films. J Low Temp Phys 28, 483–488 (1977). https://doi.org/10.1007/BF00661444

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  • DOI: https://doi.org/10.1007/BF00661444

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