Ba-Cu-O-Y, Chalcogen, Conductor, Metal, Karpinski

• 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
• high-tc superconductor
• alkaline
• chalcogen
• metal
• orthorhombic
• tetragonal