Abstract
Abstract High temperature Raman spectra on single crystals of YBa2Cu3O7-δ, TlBa2CaCu2O7-δ and Tl2Ba2CaCu2O8-δ show significant softening and broadening of apical oxygen vibrational modes above 300 K. This behaviour appears to be a common in superconducting oxides with a pyramidal O structure surrounding planar Cu ions. Although this high-temperature behaviour is characteristic of anharmonic modes, we find that a simple double well static anharmonic potential cannot fully explain these observations.
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