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To address the issue of the pseudogap in the superconducting state of thehigh temperature superconducting cuprates, we studied the temperature dependentredistribution of the spectral weight in the \textit{c}-axis polarized opticalspectra for underdoped YBa$_{2}$(Cu$_{1-x}$Zn$_{x}$)$_{3}$O$_{7-\delta}$ singlecrystals with $x=0,0.007,$ 0.012, and 0.04. It was found that for Znsubstituted samples, the spectral weight transfer to the high energy region,which characterizes the pseudogap state, continues even below thesuperconducting transition temperature (\textit{T}$_{c}$), indicating thecoexistence of the pseudogap and the superconducting gap. Moreover, theobservation of the pseudogap in the Zn-doped non-superconducting sample givesevidence that the pseudogap is not a precursor of superconductivity.

journal of the physical society of japan

Coexistence of the Pseudogap and the Superconducting Gap Revealed by the  \textit{c}-axis Optical Study of  YBa$_{2}$(Cu$_{1-x}$Zn$_{x}$)$_{3}$O$_{7-\delta}$