Crystal structure and superconductivity of Bi cuprates of type 1212 and 0212

https://doi.org/10.1016/0921-4534(94)91702-7Get rights and content

Abstract

Improved material processing of single BiO layered 1212 raises Tc to 102K with a superconducting volume fraction around 30–50% and a critical current density of 2×106 Acm−2 (5K, OT). Moreover, strong indications for the existence of Bi-1223 are present. Bi-0212 is realized for the first time in the cuprate family (Bi, Sr)2YCu2O6+z, and easily obtained for a partial substitution of Fe → Cu. According to neutron diffraction profile refinement at RT and 10K the crystal structure is tetragonal (space group 14/mmm) with double layers of (Cu,Fe)O pyramides. Additionally, the existence of isotypic Pb-0212 is reported.

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