Abstract
By using large single crystals of YBa 2Cu 3O y , precise temperature and doping dependence of the c-axis infrared active phonons are investigated. The effect of the superconducting gap opening on the phonon self-energy is observed for the optimally doped crystal but not for the overdoped crystal, which suggests that this effect becomes pronounced owing to a lower crystal symmetry due to oxygen deficiencies. The observed phonon anomalies for the in-plane oxygen mode above T c in the underdoped crystals might be associated with the c-axis conductivity suppression, and cannot be an evidence for a direct coupling of phonons to he spin system. An indirect contribution of the spin gap to the phonon system is suggested by a spectral growth around 450 cm −1.
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