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Parameterization of the critical current of low-loss; high current-density Bi-2212 as a function of magnetic field and temperature
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DOI：10.1088/1361-6668/ae5cd6.png)
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Abstract
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A physics-based parameterization of the critical current as a function of magnetic field and temperature has been developed for multi-filamentary, low alternating-current-loss, high current-density ( ) (Bi-2212) superconducting round wire. The parameterization was developed using data that were measured in applied magnetic fields T, and in temperatures K, and is valid across the entire measurement range. The parameterization uses a tri-exponential decay of the critical current with increasing magnetic field, highlighting three distinct current paths through the polycrystalline material: One for strongly connected grains, and two for weakly connected grains, which are most likely directly related to three sets of grain-alignment angles. Such analyses therefore enable probing of the internal grain-connectivity from a common 4-point -measurement. An accurate description of across the functional field-temperature parameter-space is furthermore critical for application design, which requires reliable parameterizations.
Keywords:
critical current
magnetic field
temperature
Bi-2212
grain connectivity
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