Superfluid density and angular dependence of the energy gap in optimally doped (BiPb)2(SrLa)2CuO6+ δ

Strässle, S; Khasanov, R; Kondo, T; Heron, D O G; Kaminski, A; Keller, H; Lee, S L; Takeuchi, T (2009). Superfluid density and angular dependence of the energy gap in optimally doped (BiPb)2(SrLa)2CuO6+ δ. Journal of Superconductivity and Novel Magnetism, 22(2):189-193.

Abstract

We present a muon-spin rotation study of the optimally doped cuprate superconductor (BiPb)2(SrLa)2 CuO6+δ. The measured magnetic field dependence of the in-plane magnetic penetration λ ab suggests superconductivity with a dominant d-wave order parameter. The comparison of the temperature dependence of λ ab with calculations, assuming the angular gap symmetry as obtained from photoemission measurements, is consistent with a partial suppression of the quasi-particle weight towards the anti-nodal region of the Fermi surface. This suggests that the superconducting and the pseudogap state are dominated by different parts of the Fermi surface.

Abstract

We present a muon-spin rotation study of the optimally doped cuprate superconductor (BiPb)2(SrLa)2 CuO6+δ. The measured magnetic field dependence of the in-plane magnetic penetration λ ab suggests superconductivity with a dominant d-wave order parameter. The comparison of the temperature dependence of λ ab with calculations, assuming the angular gap symmetry as obtained from photoemission measurements, is consistent with a partial suppression of the quasi-particle weight towards the anti-nodal region of the Fermi surface. This suggests that the superconducting and the pseudogap state are dominated by different parts of the Fermi surface.