Abstract
We report Raman spectra of pristine Bi 2Sr 2CaCu 2O 8+δ single crystals. Low frequency spectra of the intercalated crystal taken at room and liquid nitrogen temperatures with the 488 nm Ar + excitation line exhibit a strong band at 105 cm -1 and weaker bands at ≈ 73 and ≈ 150 cm -1. The results are confirmed by using the 647 nm Kr + excitation line. These bands characterize the fundamental vibrations of I 3-molecular anions embedded in the lattice. Drastic change of the micro-Raman scattering in the 200–700 cm -1 region is observed between pristine and iodinated crystals. A factor group analysis of stage-1 IBi 2Sr 2CaCu 2O 8+δ is presented based on possible structures and predicts that iodine vibrations can be Raman active in a non-centrosymmetric lattice.
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