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Theory of the valley-density wave and hidden order in iron pnictides

机译:铁离子谷浓度波理论与隐伏阶

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摘要

In the limit of perfect nesting, the physics of iron pnictides is governed by the density wave formation at the zone-edge vector M. At high energies, various spin- (SDW), charge-, and orbital/pocket- (PDW) density waves, and their linear combinations, all appear equally likely, unified within the unitary order parameter of U(4) × U(4) symmetry. Nesting imperfections and low-energy interactions reduce this symmetry to that of real materials. Nevertheless, the generic ground state preserves a distinct signature of its highly symmetric origins: A SDW along one axis of the iron lattice is predicted to coexist with a perpendicular PDW, accompanied by weak charge currents. This "hidden" order induces the structural transition in our theory, naturally insures T_S ≥ T_N, and leads to orbital ferromagnetism and other observable consequences.
机译:在完美嵌套的极限中,铁素化物的物理性质受区域边缘向量M处的密度波形成支配。在高能量下,各种自旋(SDW),电荷和轨道/口袋(PDW)密度这些波及其线性组合都可能出现,并且在U(4)×U(4)对称的一阶参数内统一。嵌套缺陷和低能相互作用将这种对称性降低为真实材料的对称性。然而,通用基态保留了其高度对称起源的独特特征:沿着铁晶格的一个轴的SDW预计会与垂直的PDW共存,并伴随着弱的充电电流。这种“隐藏”的顺序在我们的理论中引起了结构上的转变,自然地确保T_S≥T_N,并导致轨道铁磁性和其他可观察到的后果。

著录项

  • 来源
    《Physical review》 |2011年第2期|p.020505.1-020505.4|共4页
  • 作者

    Jian Kang; Zlatko Tesanovic;

  • 作者单位

    Institute for Quantum Matter and Department of Physics & Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA;

    Institute for Quantum Matter and Department of Physics & Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    spin-density waves;

    机译:自旋密度波;

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