Journal
PHYSICAL REVIEW B
Volume 96, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.060504
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-05ER46225]
- Center for Emergent Superconductivity, an Energy Frontier Research Center, headquartered at Brookhaven National Laboratory
- U.S. Department of Energy [DE-2009-BNL-PM015]
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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 C-2 symmetry in the Fourier transformed differential conductance.
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