Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 469, Issue 9-12, Pages 521-528Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2009.03.041
Keywords
Point contact; Andreev reflection spectroscopy; Superconducting gap; Fe-superconductors
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Funding
- NSF [DMR-0520491, DMR-0531159]
- US. Department of Energy Office of Science [DE-FG02-08ER46544]
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The Superconducting gap in FeAs-based superconductor SrnFeAs(O1-xFx) (x = 0.15 and 0.30) and the temperature dependence of the sample with x = 0.15 have been measured by Andreev reflection spectroscopy. The intrinsic superconducting gap is independent of contacts while many other gap-like features vary appreciably for different contacts. The determined gap value of 2 Delta = 13.34 +/- 0.47 meV for SmFeAs(O0.85F0.15) gives 2 Delta/k(B)T(C) = 3.68, close to the BCS prediction of 3.53. The superconducting gap decreases with temperature and vanishes at T-C, in a manner similar to the BCS behavior but dramatically different from that of the nodal pseudogap behavior in cuprate superconductors. (C) 2009 Elsevier B.V. All rights reserved.
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