Abstract
A systematic optical study of infrared-active phonons is carried out for optimally doped Bi 2Sr 2CaCu 2O 8+ δ (Bi2212) single crystals with E-vector along c-axis as well as in the ab-plane at 295 K. Strong phonon anisotropy has been observed in our ab-plane conductivity measurements. Ten infrared-active phonons have been observed along c-axis. Many of these c-axis infrared-active phonons have energies that are very close to the Raman-active A 1g modes. The group theory analysis based on the tetragonal group (D 4h) is inadequate to explain our experimental observations.
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