Perez frias

• Ba-Cu-O-Tm
• Ba-Cu-O-Y
• Ba-Cu-O-Sm
• Ba-Cu-Eu-O
• Ba-Cu-Gd-O
• structural properties
• magnetic properties
• magnetic susceptibility
• superconductivity
• alkaline
• rare earth
• chalcogen
• quaternary
• transitional
• orthorhombic
• tetragonal