Ba-Cu-O-Y, Chalcogen, Optics

• Ba-Cu-Fe-O-Y
• Ba-Co-Cu-O-Y
• Ba-Cu-H-O-Y
• Ba-Cu-O-Y-Zn
• phonons
• wavenumber of optical phonon
• optical spectra
• reflectivity
• optical conductivity
• rare earth
• transitional
• alkaline
• chalcogen
• high-tc superconductor
• orthorhombic
• tetragonal