Ba-Cu-O-Y, Intermediate valence

• Ba-Cu-Fe-O-Y
• Ba-Cu-O-Y-Zn
• Ba-Cu-Ni-O-Y
• Ba-Cu-La-O-Y
• superconductivity
• electronic and electrical properties
• superconducting transition temperature
• magnetic properties
• values of superconducting transition temperature
• rare earth
• alkaline
• intermediate valence
• chalcogen
• transitional
• orthorhombic
• tetragonal