Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819119 | Physica C: Superconductivity and its Applications | 2009 | 8 Pages |
Abstract
The superconducting gap in FeAs-based superconductor SmFeAs(O1âxFx) (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 2Π= 13.34 ± 0.47 meV for SmFeAs(O0.85F0.15) gives 2Î/kBTC = 3.68, close to the BCS prediction of 3.53. The superconducting gap decreases with temperature and vanishes at TC, in a manner similar to the BCS behavior but dramatically different from that of the nodal pseudogap behavior in cuprate superconductors.
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Authors
T.Y. Chen, S.X. Huang, Z. Tesanovic, R.H. Liu, X.H. Chen, C.L. Chien,