A theory of thermally activated flux creep in nonideal type II superconductors

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

研究成果: ジャーナルへの寄稿学術誌査読

46 被引用数 (Scopus)


The relaxation of the magnetization due to thermally activated flux creep in a bulk sample of a nonideal type II superconductor is discussed theoretically. Firstly, an expression for the average volume of a flux bundle characterizing its coherent thermal hopping motion is derived by starting with an equation for the local force balance on pinned fluxoids. Secondly, a thermal hopping rate of flux bundles is derived from the Fokker-Planck equation of pinned flux bundles. These results are used to derive expressions for both the time dependence of the magnetization and the induced electric field due to flux creep. It is shown that the present theory can quantitatively explain the existing observed data of the flux-creep rate, not only in conventional superconductors such as Nb-Ta and Pb-Tl but also in strongly-pinning bulk samples of the high-Tc oxide superconductors such as Y-Ba-Cu-O.

ジャーナルPhysica C: Superconductivity and its applications
出版ステータス出版済み - 8月 1 1989

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学


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