Download or read book Synthesis and Properties of New Family of Superconducting Copper Oxides Based on GaO Layers written by and published by . This book was released on 1991 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have discovered the first layered superconducting copper oxide with small, fixed oxidation state cations separating the conducting CuO2 planes. This material, GaSr2Y{sub 1-x}Ca(subscript x)Cu2O--, is similar to YBa2Cu3O-- with the square planar copper chains replaced by chains of edge-shared GaO4 tetrahedra. Thus, oxidation can occur only for the copper ion located in square pyramidal coordination in the CuO2 plane. The undoped parent compound, x = 0, does not show magnetic order above 4K, probably due to the presence of the thick, ionic region separating the CuO2 planes. However, this ionic region does not suppress high {Tc} superconductivity ((approximately)70K) for the doped compositions.