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首页> 外文期刊>Physical review >Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
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Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations

机译：硫属硫化物和钌酸超导体的分数幂律行为及其起源：第一性原理计算的启示

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摘要

We perform realistic first-principles calculations of iron chalcogenides and ruthenate-based materials to identify experimental signatures of Hund's-coupling-induced correlations in these systems. We find that FeTe and K_xFe_(2-y)As_2 display unusual orbital-dependent fractional power-law behavior in their quasiparticle self-energy and optical conductivity, a phenomenon first identified in SrRuO_3. Strong incoherence in the paramagnetic state of these materials results in electronic states hidden to angle-resolved photoemission spectroscopy which reemerge at low temperatures. We identify the effective low-energy Hamiltonian describing these systems and show that these anomalies are not controlled by the proximity to a quantum critical point but result from coexistence of fast quantum mechanical orbital fluctuations and slow spin fluctuations.
机译：我们对硫属硫化物和基于钌酸的材料进行现实的第一性原理计算，以识别在这些系统中洪德耦合引起的相关性的实验特征。我们发现，FeTe和K_xFe_（2-y）As_2在其准粒子自能和光导率中显示出异常的轨道相关的分数幂律行为，这是在SrRuO_3中首次发现的。这些材料在顺磁态中的强不相干性导致隐藏在低温下重新出现的角度分辨光电子能谱中隐藏的电子态。我们确定了描述这些系统的有效的低能哈密顿量，并表明这些异常不是由接近量子临界点控制的，而是由快速量子机械轨道波动和慢自旋波动的共存引起的。

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  • 来源
    《Physical review》 |2012年第19期|195141.1-195141.9|共9页
  • 作者

    Z. P. Yin; K. Haule; G. Kotliar;

  • 作者单位

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 USA;

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 USA;

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 USA;

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  • 正文语种 eng
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  • 关键词

    optical properties; electronic structure; superconducting materials;

    机译：光学性质电子结构超导材料;

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