Impurity-induced bound states inside the superconducting gap of FeSe

Jiao, Lin; Rößler, Sahana; Koz, Cevriye; Schwarz, Ulrich; Kasinathan, Deepa; Rößler, Ulrich K.; Wirth, Steffen

doi:10.1103/PhysRevB.96.094504

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Impurity-induced bound states inside the superconducting gap of FeSe

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Jiao, Lin
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Rößler, Sahana
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Koz, Cevriye
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schwarz, Ulrich
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kasinathan, Deepa
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wirth, Steffen
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Jiao, L., Rößler, S., Koz, C., Schwarz, U., Kasinathan, D., Rößler, U. K., et al. (2017). Impurity-induced bound states inside the superconducting gap of FeSe. Physical Review B, 96(9): 094504, pp. 1-7. doi:10.1103/PhysRevB.96.094504.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-F531-5

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 spinpolarized 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.