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arXiv 2008.11527cond-mat.supr-conphysics.app-ph
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全氧La $_{2}$ CuO $_{4+y}$中磁条的性质

Nature of the magnetic stripes in fully oxygenated La$_{2}$CuO$_{4+y}$

Ana-Elena Tutueanu, Henrik Jacobsen, Pia Jensen Ray, Sonja Holm-Dahlin, Monica-Elisabeta Lacatusu, Tim Birger Tejsner, Jean-Claude Grivel, Wolfgang Schmidt, Ras… 展开作者

Ana-Elena Tutueanu, Henrik Jacobsen, Pia Jensen Ray, Sonja Holm-Dahlin, Monica-Elisabeta Lacatusu, Tim Birger Tejsner, Jean-Claude Grivel, Wolfgang Schmidt, Rasmus Toft-Petersen, Paul Steffens, Martin Boehm, Barrett Wells, Linda Udby, Kim Lefmann, Astrid Tranum Rømer

摘要:

利用三轴中子散射方法研究了最佳氧掺杂的铜氧化物超导体La $_{2}$ CuO $_{4+y}$的静态和动态磁条纹,该超导体在$T_{\rm c}=42$ K处具有干净的超导转变.极化分析表明,磁条结构是平等地表示沿两个的四晶轴和波动条纹显示显着的重量,以及在平面外的自旋分量。静态磁序和低能涨落都在零外加磁场下充分发展,并且在$\hbar ω= 0.3-10$ meV处的低能自旋涨落在冷却时增强。我们解释这是一个指示,超导性和低能量的自旋波动共存微观空间区域与静态磁秩序的领域分开。

英文摘要:

We present triple-axis neutron scattering studies of static and dynamic magnetic stripes in an optimally oxygen-doped cuprate superconductor, La$_{2}$CuO$_{4+y}$, which exhibits a clean superconducting transition at $T_{\rm c}=42$ K. Polarization analysis reveals that the magnetic stripe structure is equally represented along both of the tetragonal crystal axes and that the fluctuating stripes display significant weight for in-plane as well as out-of-plane spin components. Both static magnetic order as well as low-energy fluctuations are fully developed in zero applied magnetic field and the low-energy spin fluctuations at $\hbar ω= 0.3-10$ meV intensify upon cooling. We interpret this as an indication that superconductivity and low-energy spin fluctuations co-exist microscopically in spatial regions which are separated from domains with static magnetic order.

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