Ba-Cu-O-Y, Quaternary, Rare earth

• Ba-Cu-Er-O
• Ba-Cu-Eu-O
• Ba-Cu-Gd-O
• Ba-Cu-Dy-O
• superconductivity
• electronic and electrical properties
• thermal and thermodynamic properties
• structural properties
• superconducting transition temperature
• rare earth
• quaternary
• alkaline
• chalcogen
• transitional
• orthorhombic
• tetragonal
• cubic
• trigonal