Physics – Condensed Matter – Superconductivity
Scientific paper
2008-08-25
Physics
Condensed Matter
Superconductivity
7 pages, 6 figures
Scientific paper
10.1063/1.3009286
High-temperature superconductors (HTS) are finding use as high - current wires for potential application in power devices. The dependence of their basal-plane critical current properties on orientation in a magnetic field can pose important design problems. Here we report material and operating parameter conditions where prototype HTS tape conductors exhibit critical current characteristics that are essentially field-orientation independent. The novel phenomenon is observed for specific magnetic field intensities that depend on the operating temperature, and in materials having strong flux pinning by extended nanoscale structures aligned roughly along the HTS crystalline c-axis. The effect can be described by a simple model for the field dependence of critical current density, generalized for anisotropic electronic response. This description may provide insight into means to fine-tune the material properties for nearly isotropic performance characteristics at a preferred field and temperature.
Christen David K.
Cook S. W.
Goyal Ashok
Wee Sung Hun
Zuev Yuri L.
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