Impurity-induced bound states inside the superconducting gap of FeSe
Lin Jiao, Sahana Rößler, Cevriye Koz, Ulrich Schwarz, Deepa Kasinathan, Ulrich K. Rößler, Steffen Wirth
DOI 10.1103/PhysRevB.96.094504 · Physical Review B
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Abstract
We investigate the local density of states in the vicinity of a native dumbbell defect arising from an Fe vacancy in FeSe single crystals. The tunneling spectra close to the impurity display two bound states inside the superconducting gap, equally spaced with respect to zero energy but asymmetric in amplitude. Using spin-polarized density functional theory calculations on realistic slab models with an Fe vacancy, we show that such a defect does not induce a local magnetic moment. Therefore, the dumbbell defect is considered as nonmagnetic. Thus, the in-gap bound states emerging from a nonmagnetic defect-induced pair breaking suggest a sign-changing pairing state in this material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
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