Orbital superconductivity, defects and pinned nematic fluctuations in the doped iron chalcogenide FeSe<sub>0.45</sub>Te<sub>0.55.</sub>
ORAL
Abstract
In this talk I will demonstrate that the differential conductance dI/dV, measured via spectroscopic imaging scanning tunneling microscopy in the doped iron chalcogenide FeSe0.45Te0.55, posseses 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 hole-like Fermi surfaces, and a strongly anisotropic gap on the electron-like Fermi surface. Moreover, I will show that the pinning of nematic fluctuations by defects can five 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.
*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under award No. DE-FG02-05ER46225 (D.K.M) and also Center for Emergent Superconductivity, an Energy Frontier Research Center, headquartered at Brookhaven National Laboratory, funded by the U.S. Departmen
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Presenters
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Saheli Sarkar
- Physics, Univ of Illinois - Chicago