Pinning Mechanism Studies on the Nb/Al_2O_3 Superconducting Multilayer

概要

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The transport critical current J_c of the Nb/Al_2O_3 superconducting multilayer films has been measured at 4.2 K and 1.5K under both the parallel and the perpendicular magnetic fields to the film plane. From the obtained J_c values, the pinning force density F_p in the parallel (F_<p⫽>) and the perpendicular (F_<p⊥>) directions is estimated. F_<p⊥> enhancement is drastic in comparison with F_<p⫽> but F_<p⫽> itself is also remarkably enhanced by the multilayer structure. The pinning mechanisms are discussed in reference to the pinning function curve F_<p⫽,⊥> (h). It has been found that for F_<p⊥> of multilayers showing quasi-two-dimensional superconductivity the temperature scaling law breaks down. F_<p⫽> of all multilayers roughly obeys the scaling law and shows some characteristics of usual core pinning.
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1992-05-15