Distinct doping dependences of the pseudogap and superconducting gap La${}_{2-x}$Sr${}_x$CuO${}_4$ cuprate superconductors

Abstract

We have performed a temperature-dependent angle-integrated photoemission study of lightly-doped to heavily-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$ and oxygen-doped La${}_2$CuO${}_{4.10}$. We found that both the magnitude $\Delta$* of the (small) pseudogap and the temperature \textit{T}* at which the pseudogap is opened increases with decreasing hole concentration, consistent with previous studies. On the other hand, the superconducting gap ${\Delta }_{sc}$ was found to remain small for decreasing hole concentration. The results can be explained if the superconducting gap opens only on the Fermi arc around the nodal (0,0)-($\pi ,\pi$) direction while the pseudogap opens around $\sim$($\pi$, 0).

arXiv comment4 pages, 3 figures

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