A BCS-like gap in the superconductor SmFeAsO0.85F0.15

T. Y. Chen, Z. Tesanovic, R. H. Liu, X. H. Chen and C. L. Chien ()
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T. Y. Chen: Johns Hopkins University, Baltimore, Maryland 21218, USA
Z. Tesanovic: Johns Hopkins University, Baltimore, Maryland 21218, USA
R. H. Liu: University of Science and Technology of China, Hefei, Anhui 230026, China
X. H. Chen: University of Science and Technology of China, Hefei, Anhui 230026, China
C. L. Chien: Johns Hopkins University, Baltimore, Maryland 21218, USA

Nature, 2008, vol. 453, issue 7199, 1224-1227

Abstract: Oxypnictide superconductivity: Minding the gaps Following the discovery of superconductivity near and above 50 K in oxypnictide compounds, the hunt is on for the mechanism of this unconventional superconductivity. The first measurements of the superconducting gap in the high temperature superconductor SmFeAsO0.85F0.15 give some clues. This is a crucial physical quantity, encoding qualitative and quantitative information about the nature of the superconducting state and the pairing interactions that lead to it. Chen et al. report the observation of a single gap in this superconductor. The size and detailed temperature dependence of the gap are close to that expected of a conventional 'BCS' single gap, s-wave superconductor, in contrast to the d-wave pseudogap features found in high-Tc cuprates and the two-gap structure observed in MgB2.

Date: 2008
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DOI: 10.1038/nature07081

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