Abstract
Determination of the pairing symmetry in monolayer FeSe films on is a requisite for understanding the high superconducting transition temperature in this system, which has attracted intense theoretical and experimental studies but remains controversial. Here, by introducing several types of point defects in FeSe monolayer films, we conduct a systematic investigation on the impurity-induced electronic states by spatially resolved scanning tunneling spectroscopy. Ranging from surface adsorption, chemical substitution, to intrinsic structural modification, these defects generate a variety of scattering strengths, which renders insights on the pairing symmetry.
- Received 11 August 2017
- Revised 15 December 2017
DOI:https://doi.org/10.1103/PhysRevB.97.024502
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