Low-energy bound states at interfaces between superrconducting and block antiferromagnetic regions in KxFe2-ySe2

Shantanu Mukherjee; Maria Navarro Gastiasoro; P. J.  Hirschfeld; Brian Møller Andersen

doi:10.1103/PhysRevB.88.014519

Low-energy bound states at interfaces between superrconducting and block antiferromagnetic regions in K_xFe_2-ySe₂

Shantanu Mukherjee, Maria Navarro Gastiasoro, P. J. Hirschfeld, Brian Møller Andersen

3 Citations (Scopus)

Abstract

The high-T_c alkali doped iron selenide superconductors K _xFe_2-ySe₂ have been recently shown to be intrinsically phase separated into Fe vacancy ordered block antiferromagnetic regions and superconducting regions at low temperatures. In this work, we use a microscopic five orbital Hubbard model to obtain the electronic low-energy states near the interfaces between block antiferromagnets and superconductors. It is found that abundant low-energy in-gap bound states exist near such interfaces irrespective of whether the superconductor has d- or s-wave pairing symmetry. By contrast, it is shown how scattering from (110) boundaries can provide a natural means to distinguish between these two leading pairing instabilities of the K_xFe_2-ySe₂ materials.

Original language	English
Journal	Physical Review B. Condensed Matter and Materials Physics
Volume	88
Issue number	1
Pages (from-to)	014519
Number of pages	7
ISSN	2469-9950
DOIs	https://doi.org/10.1103/PhysRevB.88.014519
Publication status	Published - 22 Jul 2013

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Low-energy bound states at interfaces between superrconducting and block antiferromagnetic regions in K_xFe_2-ySe₂. / Mukherjee, Shantanu; Navarro Gastiasoro, Maria; Hirschfeld, P. J. et al.

In: Physical Review B. Condensed Matter and Materials Physics, Vol. 88, No. 1, 22.07.2013, p. 014519.

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AU - Andersen, Brian Møller

PY - 2013/7/22

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N2 - The high-Tc alkali doped iron selenide superconductors K xFe2-ySe2 have been recently shown to be intrinsically phase separated into Fe vacancy ordered block antiferromagnetic regions and superconducting regions at low temperatures. In this work, we use a microscopic five orbital Hubbard model to obtain the electronic low-energy states near the interfaces between block antiferromagnets and superconductors. It is found that abundant low-energy in-gap bound states exist near such interfaces irrespective of whether the superconductor has d- or s-wave pairing symmetry. By contrast, it is shown how scattering from (110) boundaries can provide a natural means to distinguish between these two leading pairing instabilities of the KxFe2-ySe2 materials.

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Low-energy bound states at interfaces between superrconducting and block antiferromagnetic regions in KxFe2-ySe2

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Low-energy bound states at interfaces between superrconducting and block antiferromagnetic regions in K_xFe_2-ySe₂