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首页> 外文期刊>Physical review >Modulated superconductivity due to vacancy and magnetic order in AyFe2-x/2Se2[A = Cs, K, (Tl,Rb), (T1,K)] iron-selenide superconductors
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Modulated superconductivity due to vacancy and magnetic order in AyFe2-x/2Se2[A = Cs, K, (Tl,Rb), (T1,K)] iron-selenide superconductors

机译:AyFe2-x / 2Se2 [A = Cs,K,(Tl,Rb),(T1,K)]硒化铁超导体归因于空位和磁序的调制超导

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摘要

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 IA/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 14/ m one. For the specific case of an incommensurate vacancy order at Qv = (j,§) in K0.82(2)Fei.626(3)Se2, we find that it induces a block checkerboard antiferromagnetic phase at wave vector Qm = 4QK. 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.
机译:我们提出了硒化铁超导体中“调制”超导状态的计算。零动量d波对破坏了IA / mmm空间群的常规BaFe2Se2样晶体的平移对称性。当Fe空位形成有序状态并且晶体对称性变为低温14 / m 1时,该配对状态变得相容。对于K0.82(2)Fei.626(3)Se2中Qv =(j,§)的空缺顺序不相称的特定情况,我们发现它在波矢Qm = 4QK时引起了块状棋盘反铁磁相。空位阶和磁阶的并存导致重构的基态,该基态自然地以均匀相耦合到d波超导,在我们看来,这将是所有硒化铁超导体的一般耦合。我们的结果与迄今为止可获得的大量实验数据相吻合。因此,我们建议不可通约性导致多相的均匀共存,作为高Tc超导体中纳米级相分离的可行替代方法,并且在增强超导性中起重要作用。

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  • 来源
    《Physical review》 |2011年第11期|p.264-269|共6页
  • 作者

    Tanmoy Das; A. V. Balatsky;

  • 作者单位

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA,Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

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