Phys. Rev. Lett. 101, 097009 (2008) [4 pages]Field and Temperature Dependence of the Superfluid Density in LaFeAsO1-xFx Superconductors: A Muon Spin Relaxation StudyReceived 18 April 2008; published 29 August 2008 We present zero field and transverse field muon spin relaxation experiments on the recently discovered Fe-based superconductor LaFeAsO1-xFx (x=0.075 and x=0.1). The temperature dependence of the deduced superfluid density is consistent with a BCS s-wave or a dirty d-wave gap function, while the field dependence strongly evidences unconventional superconductivity. We obtain the in-plane penetration depth of λab(0)=254(2) nm for x=0.1 and λab(0)=364(8) nm for x=0.075. Further evidence for unconventional superconductivity is provided by the ratio of Tc versus the superfluid density, which is close to the Uemura line of high-Tc cuprates. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.097009
DOI:
10.1103/PhysRevLett.101.097009
PACS:
74.70.−b, 76.75.+i
See AlsoSee Also: A. J. Drew, F. L. Pratt, T. Lancaster, S. J. Blundell, P. J. Baker, R. H. Liu, G. Wu, X. H. Chen, I. Watanabe, V. K. Malik, A. Dubroka, K. W. Kim, M. Rössle, and C. Bernhard, Coexistence of Magnetic Fluctuations and Superconductivity in the Pnictide High Temperature Superconductor SmFeAsO1-xFx Measured by Muon Spin Rotation, Phys. Rev. Lett. 101, 097010 (2008). |
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