Abstract
Bulk-textured YBa2Cu3O7-x single domains could be usedfor current-limiting applications by cutting and assembling long meanders,which would be submitted to network electric fields before using a breaker tointerrupt a fault current. For that purpose, large YBaCuO single domains up to93 mm in diameter can be isothermally grown by using a standard melt texturinggrowth (MTG) process with a SmBaCuO seed. The essential parameters that haveto be controlled in order to reach this size are the temperature growthwindow, the substrate reactivity and the temperature homogeneity in thesample. Standard 45 mm diameter single domains show excellent superconductingproperties, such as Jc above 105 A cm-2 and a homogeneoussuperconducting-to-normal transition at 91.8 K for 20 cm long conductors cutin these pellets. These measurements demonstrate the long -range homogeneityof single domains regarding Tc and Jc. Nevertheless the high Jcvalues lead to a too large a dissipation in the normal state at T = 77 K.Different methods to reduce the critical current density are described inorder to fulfill the conditions for a safe recovery of the material afterundergoing a magnetothermal transition.
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