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

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

2006-10-27

arxiv.org/abs/cond-mat/0610758v3

Phys. Rev. B 75, 140503(R) (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.75.140503

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).

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