Growth of single crystals of High T sub c superconductors.

Crystals of cuprate-based superconductors, important for measurements of physical properties as a function of crystallographic orientation and measurements free of grain boundary effects, have been grown using high-temperature solution growth techniques. Eutectic melt growth, slow-cooling of copper-rich compositions has yielded single crystals of Ba sub 2 YCu sub 3 O sub 7 as well as Bi sub (2.2) Sr sub 2 Ca sub (0.8) Cu sub 2 O sub (8+delta). Alkali chloride fluxes are also useful for the growth of superconducting single crystals in the Bi-Sr-Ca-Cu-O system. Characterization of alkali chloride- grown Bi sub (2.2) Sr sub 2 Ca sub (0.8) Cu sub 2 O sub (8+delta) crystals by Rutherford Backscattering and transport measurements of the critical current density are described.