Improved Uniformity of Superconducting Properties in GdBCO Superconductor Bulk with a Buffer Layer
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Abstract
Uneven distribution of local superconducting properties can significantly impact the overall performance of REBa2Cu3O7-δ (REBCO or RE123) superconductor bulks. Through the modified top-seeded melt-texture growth method, we successfully prepared single-domain GdBa2Cu3O7-δ (GdBCO) superconductor bulks with (bulk A) and without (bulk B) a buffer layer, and investigated the relationship between superconducting properties and microstructure of the bulks in detail. Measurement results show that the maximum trapped flux density value of bulk A is 0.48 T, and that of bulk B is 0.5 T. The distribution of transition temperature (TC) and critical current density (JC) becomes more uniform along the c- and a/b-directions in bulk A. In bulk B, i.e., without a buffer layer, the JC varies greatly at different locations due to microstructural inhomogeneity. The buffer layer acting as a large seed can increase the growth rate, resulting in a decrease in the size and an increase in the concentration of Gd2BaCuO5 (Gd211) particles in the microstructure according to pushing/trapping and coarsening theory. The corresponding JC performance shows a certain improvement in all fields, which suggests that the buffer layer has a positive effect on the spatial uniformity of superconducting properties in superconductor bulks.
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