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For high-Tc superconductors, clarifying the role and origin of the pseudogapis essential for understanding the pairing mechanism. Among the various modelsdescribing the pseudogap, the preformed Cooper pair model is a potentialcandidate. Therefore, we present experimental evidence for the preformed Cooperpair model by studying the pseudogap spectrum observed in the opticalconductivity of a Ca10(Pt4As8)(Fe2As2)5 (Tc = 34.6 K) single crystal. Weobserved a clear pseudogap structure in the optical conductivity and observedits temperature dependence. In the superconducting (SC) state, one SC gap witha gap size of {\Delta} = 26 cm-1, a scattering rate of 1/{\tau} = 360 cm-1 anda low-frequency extra Drude component were observed. Spectral weight analysisrevealed that the SC gap and pseudogap are formed from the same Drude band.This means that the pseudogap is a gap structure observed as a result of acontinuous temperature evolution of the SC gap observed below Tc. This providesclear experimental evidence for the preformed Cooper pair model.

Evidence for a preformed Cooper pair model in the pseudogap spectra of a Ca10(Pt4As8)(Fe2As2)5 single crystal with a nodal superconducting gap