http://ptonline.aip.org/journals/doc/PH ... 30_1.shtml
The material is BSSCO (Bi2Sr2Ca2Cu3O10-x), which has a Tc over 77K. Interesting quote relevant to the discussions held here:
However, both AMSC and its major US competitor, SuperPower Inc, in Schenectady, NY, have abandoned BSCCO due to long-awaited manufacturing success in depositing nearly single-crystal layers of YBCO onto nickel-alloy flexible tapes. "The first-generation wires were somewhat of a stopgap because they contain a high amount of silver, which presents a barrier to reducing the cost," said Patrick Duggan, a project manager with Con Edison. YBCO exhibits critical current densities on the order of 106 A/cm2 and also outperforms BSCCO at elevated temperatures in high magnetic fields.