Composition derivative of superconducting transition temperature, Cu-O

• Ba-Cu-O-Y-Zn
• Ba-Cu-Ni-O-Y
• Ba-Cu-Fe-O-Y
• Ba-Co-Cu-O-Y
• Ba-Cu-Er-Ni-O
• chalcogen
• transitional
• alkaline
• conductor
• rare earth
• orthorhombic
• tetragonal