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  Impurity-induced bound states inside the superconducting gap of FeSe

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.

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 Creators:
Jiao, Lin1, Author           
Rößler, Sahana1, Author           
Koz, Cevriye2, Author           
Schwarz, Ulrich3, Author           
Kasinathan, Deepa1, Author           
Rößler, Ulrich K.4, Author
Wirth, Steffen5, Author           
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863423              
4External Organizations, ou_persistent22              
5Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863460              

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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 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.

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Language(s): eng - English
 Dates: 2017-09-072017-09-07
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 96 (9) Sequence Number: 094504 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008