Modulated superconductivity due to vacancy and magnetic order in AyFe2−x/2Se2 [A=Cs, K, (Tl,Rb), (Tl,K)] iron-selenide superconductors
Tanmoy Das, A. V. Balatsky
DOI 10.1103/PhysRevB.84.115117 · Physical Review B
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Abstract
We present a calculation of a “modulated” superconducting state in iron-selenide superconductors. The zero-momentum d-wave pairing breaks the translational symmetry of the conventional BaFe2Se2-like crystal of the I4/mmm space group. This pairing state becomes compatible when the Fe vacancies form an ordered state and the crystal symmetry changes to a low-temperature I4/m one. For the specific case of an incommensurate vacancy order at Qv=(15,35) in K0.82(2)Fe1.626(3)Se2, we find that it induces a block checkerboard antiferromagnetic phase at wave vector Qm=4Qv. The coexistence of vacancy order and magnetic order leads to a reconstructed ground state which naturally couples to the d-wave superconductivity in a uniform phase in what we propose will be a general coupling for all iron-selenide superconductors. Our results agree with numerous experimental data available to date. We thus suggest that the incommensurability leads to a uniform coexistence of multiple phases as a viable alternative to a nanoscale phase separation in high-Tc superconductors and play an important role in the enhancement of superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K0.82(2)Fe1.626(3)Se2 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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