Saturation to nonsaturation transition of macroscopic pinning force in superconductors

K. Yamafuji, T. Fujiyoshi, K. Toko, T. Matsushita

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3 Citations (Scopus)


A new flux-pinning mechanism is proposed for moderately strong pins showing a saturation of macroscopic pinning force density Fp at high fields. For moderately strong pins, a shear correlation length in a pinned fluxoid lattice decreases to the order of lattice spacing at high fields. It is shown that a phase separation between an amorphous-like, dense-dislocation phase and a crystal-like, dilute-dislocation phase occurs to minimize the free energy of the pinned fluxoid lattice. In this case, the derived expression for Fp at high fields shows a saturation tendency which is almost insensitive to an increase of the elementary pinning force, fp. As fp becomes stronger, the volume fraction of the dense-dislocation phase increases and, finally, the whole fluxoid lattice is occupied only by the amorphous-like, dense-dislocation phase. A nonsaturation of Fp then appears even at high fields.

Original languageEnglish
Pages (from-to)245-250
Number of pages6
Issue number3 SUPPL.
Publication statusPublished - Mar 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Materials Science(all)


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