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DC Field | Value | Language |
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dc.citation.number | 2 | - |
dc.citation.startPage | 020515 | - |
dc.citation.title | PHYSICAL REVIEW B | - |
dc.citation.volume | 82 | - |
dc.contributor.author | Zhang, Xiaohang | - |
dc.contributor.author | Oh, Yoon Seok | - |
dc.contributor.author | Liu, Yong | - |
dc.contributor.author | Yan, Liqin | - |
dc.contributor.author | Saha, Shanta R. | - |
dc.contributor.author | Butch, Nicholas P. | - |
dc.contributor.author | Kirshenbaum, Kevin | - |
dc.contributor.author | Kim, Kee Hoon | - |
dc.contributor.author | Paglione, Johnpierre | - |
dc.contributor.author | Greene, Richard L. | - |
dc.contributor.author | Takeuchi, Ichiro | - |
dc.date.accessioned | 2023-12-22T07:06:57Z | - |
dc.date.available | 2023-12-22T07:06:57Z | - |
dc.date.created | 2015-07-08 | - |
dc.date.issued | 2010-07 | - |
dc.description.abstract | We have systematically investigated the doping and the directional dependence of the gap structure in the 122-type iron pnictide superconductors by point contact Andreev reflection spectroscopy. The studies were performed on single crystals of Ba1-xKxFe2As 2(x=0.29, 0.49, and 0.77) and SrFe1.74 Co0.26 As2 with a sharp tip of Pb or Au pressed along the c -axis or the ab -plane direction. The conductance spectra obtained on highly transparent contacts clearly show evidence of a robust superconducting gap. The normalized curves can be well described by the Blonder-Tinkham-Klapwijk model with a lifetime broadening. The determined gap value scales very well with the transition temperature, giving the 2Δ/ kB TC value of ∼3.1. The results suggest the presence of a universal coupling behavior in this class of iron pnictides over a broad doping range and independent of the sign of the doping. Moreover, conductance spectra obtained on c -axis junctions and ab -plane junctions indicate that the observed gap is isotropic in these superconductors. © 2010 The American Physical Society. | - |
dc.identifier.bibliographicCitation | PHYSICAL REVIEW B, v.82, no.2, pp.020515 | - |
dc.identifier.doi | 10.1103/PhysRevB.82.020515 | - |
dc.identifier.issn | 2469-9950 | - |
dc.identifier.scopusid | 2-s2.0-77956511604 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/12061 | - |
dc.identifier.url | http://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.020515 | - |
dc.identifier.wosid | 000280474800003 | - |
dc.language | 영어 | - |
dc.publisher | AMER PHYSICAL SOC | - |
dc.title | Evidence of a universal and isotropic 2 Δ/k B T C ratio in 122-type iron pnictide superconductors over a wide doping range | - |
dc.type | Article | - |
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