Ba-Cu-O-Y, Square pyramid 5-vertex, Superconductivity, Tetragonal

• Ba-Cu-Fe-O-Y
• Ba-Co-Cu-O-Y
• Ba-Cu-La-O-Y
• Al-Ba-Cu-O-Y
• superconducting transition temperature
• values of superconducting transition temperature
• lowest temperature of investigation
• critical magnetic field
• disordered
• cuprate
• chalcogen
• alkaline
• high-tc superconductor