Thin superconducting disk with B-dependent J(c): Flux and current distributions

Article

关键词: AC SUSCEPTIBILITY MEASUREMENTS;    CRITICAL-CURRENT DENSITY;    CRITICAL-STATE MODEL;    II SUPERCONDUCTORS;    MAGNETIC-FIELD;    FILMS;    PENETRATION;    LOSSES;    CREEP;   

DOI  :  10.1103/PhysRevB.60.13112

来源: SCIE

【 摘 要 】

The critical state in a superconducting thin circular disk with an arbitrary magnetic field dependence of:he critical sheet current, J(c)(B), is analyzed. With an applied field B-a perpendicular to the disk, a set of coupled integral equations for the flux and current distributions is derived. The equations are solved numerically, and flux and current profiles are presented graphically for several commonly used J(c)(B) dependences. It is shown that for small B-a the flux penetration depth can be described by an effective Bean model with a renormalized J(c) entering the leading term. We argue that these results are qualitatively correct for thin superconductors of (any shape. The results contrast the parallel geometry behavior, where at small B-a the B dependence of the critical current can be ignored. [S0163-1829(99)12541-4].

【 授权许可】

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