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The in-plane magnetic penetration depth \lambda_{ab} in optimally doped(BiPb)_2(SrLa)_2CuO_{6+\delta} (OP Bi2201) was studied by means of muon-spinrotation. The measurements of \lambda_{ab}^{-2}(T) are inconsistent with asimple model of a d-wave order parameter and a uniform quasiparticle weightaround the Fermi surface. The data are well described assuming the angular gapsymmetry obtained in ARPES experiments [Phys. Rev. Lett {\bf 98}, 267004(2007)], where it was shown that the superconducting gap in OP Bi2201 existsonly in segments of the Fermi surface near the nodes. We find that theremaining parts of the Fermi surface, which are strongly affected by thepseudogap state, do not contribute significantly to the superconductingcondensate. Our data provide evidence that high temperature superconductivityand pseudogap behavior in cuprates are competing phenomena.

Evidence for competition between the superconducting and the pseudogap state in (BiPb)_2(SrLa)_2CuO_{6+\delta} from muon-spin rotation experiments