Transport - and inductive critical current densities in superconducting MgB2

Details Transport - and inductive critical current densities in superconducting MgB2 Transport - and inductive critical current densities in superconducting MgB2

2001-04-20

arxiv.org/abs/cond-mat/0104395v2

Physics

Condensed Matter

Superconductivity

15 pages, 14 figures, submitted to Physica C

Scientific paper

10.1016/S0921-4534(01)00940-6

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-resisitivity, indicative of a flux-flow regime.

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