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dc.contributor.authorSingh, Udai Raj
dc.contributor.authorWhite, Seth C.
dc.contributor.authorSchmaus, Stefan
dc.contributor.authorTsurkan, Vladimir
dc.contributor.authorLoidl, Alois
dc.contributor.authorDeisenhofer, Joachim
dc.contributor.authorWahl, Peter
dc.identifier.citationSingh , U R , White , S C , Schmaus , S , Tsurkan , V , Loidl , A , Deisenhofer , J & Wahl , P 2013 , ' Spatial inhomogeneity of the superconducting gap and order parameter in Se 0.4 Te 0.6 ' , Physical Review. B, Condensed matter and materials physics , vol. 88 , no. 15 , 155124 .
dc.identifier.otherPURE: 75555836
dc.identifier.otherPURE UUID: ac607eb9-5e0b-414b-aa92-057c85f2acbf
dc.identifier.otherScopus: 84887115439
dc.identifier.otherORCID: /0000-0002-8635-1519/work/46939684
dc.descriptionU.R.S. acknowledges support by the Alexander-von-Humboldt Foundation; furthermore, we acknowledge support by SPP1458 of the DFG through Projects No. WA2510/1-1 and No. DE1762/1-1.en
dc.description.abstractWe have performed a low-temperature scanning tunneling microscopy and spectroscopy study of the iron chalcogenide superconductor FeSe0.4Te0.6 with TC≈14 K. Spatially resolved measurements of the superconducting gap reveal substantial inhomogeneity on a nanometer length scale. Analysis of the structure of the gap seen in tunneling spectra by comparison with calculated spectra for different superconducting order parameters (s-wave, d-wave, and anisotropic s-wave) yields the best agreement for an order parameter with anisotropic s-wave symmetry with an anisotropy of ∼40%. The temperature dependence of the superconducting gap observed in places with large and small gap size indicates that it is indeed the superconducting transition temperature which is inhomogeneous. The temperature dependence of the gap size has been found to differ from the one predicted by BCS theory. An analysis of the local gap size in relation to the local chemical composition shows almost no correlation with the local concentration of Se/Te atoms at the surface.
dc.relation.ispartofPhysical Review. B, Condensed matter and materials physicsen
dc.rights© 2013. American Physical Society.en
dc.subjectIron-based superconductorsen
dc.subjectScanning tunneling microscopyen
dc.subjectScanning tunneling spectroscopyen
dc.subjectQC Physicsen
dc.titleSpatial inhomogeneity of the superconducting gap and order parameter in Se0.4Te0.6en
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Condensed Matter Physicsen
dc.description.statusPeer revieweden

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