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Transport and inductive critical current densities in superconducting MgB2

机译：超导MgB2中的传输和电感性临界电流密度

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摘要

The critical current density of four MgB2 samples was measured inductively and for one of them also by transport. Pure phased and dense bulk samples yield a critical current density which in value, as well as in its magnetic field and temperature dependence, is essentially the same as the intra-granular current density measured in a dispersed powder. Also the correspondence between the inductive and transport data indicates that the grain boundaries in the bulk samples are totally transparent for the current. The current-voltage relation becomes rapidly shallow in the vicinity of a depinning line, well below the second critical field. Between the depinning line and the second critical field the material is ohmic and shows a marked magneto-resistivity, indicative of a flux-flow regime. (C) 2001 Elsevier Science BN. All rights reserved. [References: 15]
机译：电感测量了四个MgB2样品的临界电流密度，其中一个也通过传输进行了测量。纯相和致密的块状样品会产生临界电流密度，该临界电流密度的值以及与磁场和温度的关系与在分散粉末中测得的颗粒内电流密度基本相同。感应数据和传输数据之间的对应关系也表明，大块样品中的晶界对电流是完全透明的。在去钉线附近，电流电压关系迅速变浅，远低于第二临界场。在固定销线和第二临界场之间，材料是欧姆性的，并显示出显着的磁阻，表明磁通流态。 （C）2001 Elsevier Science BN。版权所有。 [参考：15]

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