Normal-superconducting transition induced by high current densities in YBa2Cu3O7-delta melt-textured samples and thin films: Similarities and differences

Article

关键词: FLUX-FLOW INSTABILITY;    BOILING HEAT-TRANSFER;    ELECTRONIC INSTABILITY;    CERAMIC Y1BA2CU3O7-DELTA;    TRANSPORT CURRENTS;    DISSIPATIVE STATE;    YBCO;    ANISOTROPY;    DYNAMICS;    BEHAVIOR;   

DOI  :  10.1103/PhysRevB.68.054514

来源: SCIE

【 摘 要 】

Current-voltage characteristics of top-seeded melt-textured YBa2Cu3O7-delta are presented. The samples were cut out of centimetric monoliths. Films characteristics were also measured on microbridges patterned on thin films grown by dc sputtering. For both types of samples, a quasidiscontinuity or quenching was observed for a current density J(*) several times the critical current density J(c). Though films and bulks differ much in their magnitude of both J(c) and J(*), a proposal is made as to a common intrinsic origin of the quenching phenomenon. The unique temperature dependence observed for the ratio J(*)/J(c), as well as the explanation of the prequenching regime in terms of a single dissipation model, lends support to our proposal.

【 授权许可】

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