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- W2045501312 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 BaFe${}_{2}$Se${}_{2}$-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 ${Q}_{v}=(frac{1}{5},frac{3}{5})$ in K${}_{0.82(2)}$Fe${}_{1.626(3)}$Se${}_{2}$, we find that it induces a block checkerboard antiferromagnetic phase at wave vector ${mathbf{Q}}_{m}=4{mathbf{Q}}_{v}$. 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-${T}_{c}$ superconductors and play an important role in the enhancement of superconductivity." @default.
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- W2045501312 date "2011-09-19" @default.
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- W2045501312 title "Modulated superconductivity due to vacancy and magnetic order in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>A</mml:mi><mml:mi>y</mml:mi></mml:msub></mml:math>Fe<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>Se<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML …" @default.
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- W2045501312 doi "https://doi.org/10.1103/physrevb.84.115117" @default.
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