Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe0.45Te0.55

We demonstrate that the differential conductance, dI/dV, measured via spectroscopic imaging scanning tunneling microscopy in the doped iron chalcogenide FeSe0.45Te0.55, possesses a series of characteristic features that allow one to extract the orbital structure of the superconducting gaps. This yie...

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Veröffentlicht in:Physical review. B 2017-08, Vol.96 (6)
Hauptverfasser: Sarkar, Saheli, Dyke, John Van, Sprau, Peter O, Massee, Freek, Welp, Ulrich, Kwok, Wai-Kwong, Seamus Davis, J C, Morr, Dirk K
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Sprache:eng
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Zusammenfassung:We demonstrate that the differential conductance, dI/dV, measured via spectroscopic imaging scanning tunneling microscopy in the doped iron chalcogenide FeSe0.45Te0.55, possesses a series of characteristic features that allow one to extract the orbital structure of the superconducting gaps. This yields nearly isotropic superconducting gaps on the two holelike Fermi surfaces, and a strongly anisotropic gap on the electronlike Fermi surface. Moreover, we show that the pinning of nematic fluctuations by defects can give rise to a dumbbell-like spatial structure of the induced impurity bound states, and explains the related C2 symmetry in the Fourier transformed differential conductance.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.060504