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首页> 外文期刊>Physica, C. Superconductivity and its applications >ANALYSIS OF TRANSPORT CRITICAL CURRENT DENSITY IN A BENT BI-PB-SR-CA-CU-O SILVER-SHEATHED TAPE
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ANALYSIS OF TRANSPORT CRITICAL CURRENT DENSITY IN A BENT BI-PB-SR-CA-CU-O SILVER-SHEATHED TAPE

机译：弯曲的BI-PB-SR-CA-CU-O银色护套磁带的运输临界电流密度分析

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The experimental results on the magnetic behavior of the transport critical current density in a bent Bi based superconducting tape have shown that the irreversible strain limit epsilon(irrev) for the onset of permanent strain damage to Ag sheathed superconductors is not dependent on the magnetic field, nor does the normalized I-c(H, epsilon)/I-c(0, epsilon) current depend on the strain at least up to 0.5 T at 77 K. Such a behavior has been attributed to two reasons: (1) The intrinsic pinning properties are unchanged in a bent tape; (2) The strain effect is extrinsic and arises from superconductor cracks. Thus, based on these arguments a Josephson junction tunneling model with cracks in between the grain boundaries is proposed to explain the J(c) behavior quite well for a bent granular high-T-c superconducting tape. Our model calculation shows that the critical current density of high-T-c superconductor may be enhanced by increasing the strain tolerance epsilon(irrev) and the epsilon(irrev) is determined by the properties of Ag sheathed tape and its related material parameters, which are dependent on the connectivity of the grain boundaries. [References: 19]
机译：对弯曲的Bi基超导带中的传输临界电流密度的磁行为的实验结果表明，对Ag护套超导体产生永久性应变破坏的不可逆应变极限ε（irrev）与磁场无关，归一化的Ic（H，epsilon）/ Ic（0，epsilon）电流也不取决于至少在77 K时高达0.5 T的应变。这种行为归因于两个原因：（1）固有的钉扎特性是用弯曲的胶带保持不变; （2）应变效应是外在的，是由超导体裂纹引起的。因此，基于这些论点，提出了在晶界之间具有裂纹的约瑟夫森结隧穿模型，以很好地解释弯曲的粒状高T-c超导带的J（c）行为。我们的模型计算表明，可以通过增加应变容限ε（irrev）来提高高Tc超导体的临界电流密度，而ε（ε）取决于Ag护套胶带的性能及其相关的材料参数，这取决于在晶界的连通性上。 [参考：19]

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