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Phys. Rev. Lett. 101, 227002 (2008) [4 pages]

Evidence for a Competition between the Superconducting State and the Pseudogap State of (BiPb)2(SrLa)2CuO6+δ from Muon Spin Rotation Experiments

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R. Khasanov1,2,*, Takeshi Kondo3,4, S. Strässle2, D. O. G. Heron5, A. Kaminski3, H. Keller2, S. L. Lee5, and Tsunehiro Takeuchi4,6
1Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
2Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
3Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
4Department of Crystalline Materials Science, Nagoya University, Nagoya 464-8603, Japan
5School of Physics and Astronomy, University of St. Andrews, Fife, KY16 9SS, United Kingdom
6EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan

Received 11 June 2008; published 24 November 2008

The in-plane magnetic penetration depth λab in optimally doped (BiPb)2(SrLa)2CuO6+δ (OP Bi2201) was studied by means of muon-spin rotation. The measurements of λab-2(T) are inconsistent with a simple model of a d-wave order parameter and a uniform quasiparticle weight around the Fermi surface. The data are well described assuming the angular gap symmetry obtained in ARPES experiments [ Phys. Rev. Lett. 98 267004 (2007)], which suggest that the superconducting gap in OP Bi2201 exists only in segments of the Fermi surface near the nodes. The remaining parts of the Fermi surface, which are strongly affected by the pseudogap state, do not contribute significantly to the superconducting condensate.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.227002
DOI:
10.1103/PhysRevLett.101.227002
PACS:
74.72.Hs, 74.25.Jb, 76.75.+i

*rustem.khasanov@psi.ch

 
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