Raman and IR Spectra of Bi-Sr-Ca-Cu-O Compounds

Raman and IR spectra of three samples with the nominal compositions Bi_1.2Sr_1.8Cu₃O_x,BiSrCaCu₃O_x and Bi_1.2Sr_0.9Ca_0.9Cu₃O_x were measured at room temperature. The prominent differences were observed in the spectra between superconducting and nonsuperconducting materials. The superconducting phase in SP2 and SP3 were considered to be Bi₂Sr₂CaCu₂O₈, and some vibrational bands of superconducting samples were assigned, Cu-O bent modes at 462 and 294cm^-1 in Raman spectra were suggested to associate with the superconductivity of SP2 and SP3.