Multi-seeded melt growth (MSMG) of bulk Y-Ba-Cu-O using thin-film seeds

Details Multi-seeded melt growth (MSMG) of bulk Y-Ba-Cu-O using thin-film seeds Multi-seeded melt growth (MSMG) of bulk Y-Ba-Cu-O using thin-film seeds

2010-06-25

arxiv.org/abs/1006.4927v1

Physics

Condensed Matter

Superconductivity

Scientific paper

Y-Ba-Cu-O (YBCO) and Sm-Ba-Cu-O (SmBCO) thin films have been used for the first time as heterogeneous seeds to multi-seed successfully the melt growth of bulk YBCO in a multi-seeded melt growth (MSMG) process. The use of thin film seeds, which may be prepared with highly controlled orientation (i.e. with a well-defined a-b plane and precisely known a-direction), is based on their superheating properties and reduces significantly contamination of the bulk sample by the seed material. A variety of grain boundaries were obtained by varying the angle between the seeds. Microstructural studies indicate that the extent of residual melt deposited at the grain boundary decreases with increasing grain boundary contact angle. It is established that the growth front proceeds continuously at the (110)/(110) grain boundary without trapping liquid, which leads to the formation of a clean grain boundary.

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