Abstract
A systematic optical study of well characterized, Y-substituted ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ single crystals covering the range from optimal doping to the insulating phase is presented. Special attention is given to comparisons with two other prototype cuprate systems ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ and ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}.$ It is emphasized that dynamical charge stripe correlations play an important role in governing the difference in optical response between these systems.
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