Ba-Cu-O-Y, Chalcogen, Karpinski, Orthorhombic

• Ba-Ca-Cu-O-Y
• Ba-Cu-O-Sr-Y
• superconductivity
• superconducting transition temperature
• structural properties
• values of superconducting transition temperature
• electronic and electrical properties
• conductor
• disordered
• alkaline
• chalcogen
• high-tc superconductor