Abstract
In this letter it is proposed that specific optical features in the infrared spectrum of the high- T c superconductors are caused by InterValence Charge Transfer (IVCT) transitions. An IVCT transition involves optical transfer of an electron from one cation to another. It is proposed that when charge carriers are localized as a result of the electron-lattice interaction as calculated by Fu and Freeman, optical charge transfer occurs between two inequivalent Cu ions in a manner similar as the Fe 2+Fe 3+ charge interaction, which is several minerals. The role of the electron-lattice interaction, which is probably important for the superconductivity mechanism, is compared for several oxide compounds.
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