Low-energy bound states at interfaces between superconducting and block antiferromagnetic regions in KxFe2−ySe2
S. Mukherjee, M. N. Gastiasoro, P. J. Hirschfeld, B. M. Andersen
DOI 10.1103/PhysRevB.88.014519 · Physical Review B
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Abstract
The high-Tc alkali doped iron selenide superconductors KxFe2−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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
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