铁磷族化合物中不寻常自旋动力学的关键作用
A key role for unusual spin dynamics in ferropnictides
摘要：
2008年发现的Tc~ 26 K-56 K的超导铁磷族化合物将一个新的材料家族引入高Tc超导体的范畴。正在进行的理解超导机制和配对对称性的项目已经揭示了结构和磁性的复杂且往往相互矛盾的潜在图景。计算出的磁性和费米面对结构细节的敏感性几乎是前所未有的，这使得它们无法与实验相对应。此外，实验探测的序参量对称性是在令人惊讶的强烈分歧，即使考虑到相对不成熟的领域。在这里，我们概述了所有的各种各样的和看似矛盾的证据，无论是理论和实验，并表明，他们可以被纠正，如果系统被假定为高磁性的自旋密度波是明确的，但与磁性孪生和反相边界是动态的时间尺度上的实验。在这个假设下，我们发现，我们的计算可以准确地再现甚至非常精细的结构细节，并提供了一个自然的解释的温度分离的结构和磁性转变。因此，我们的理论在关键领域恢复了实验和理论之间的一致性，使两个方面的进一步合作进展成为可能。我们相信，波动的磁畴将是解开这些最新的高Tc超导体的磁相互作用和超导性之间的相互作用的一个重要组成部分。
英文摘要：
The 2008 discovery of superconducting ferropnictides with Tc~26K-56K introduced a new family of materials into the category of high Tc superconductors. The ongoing project of understanding the superconducting mechanism and pairing symmetry has already revealed a complicated and often contradictory underlying picture of the structural and magnetic properties. There is an almost unprecedented sensitivity of the calculated magnetism and Fermi surface to structural details that prohibits correspondence with experiment. Furthermore, experimental probes of the order parameter symmetry are in surprisingly strong disagreement, even considering the relative immaturity of the field. Here we outline all of the various and seemingly contradictory evidences, both theoretical and experimental, and show that they can be rectified if the system is assumed to be highly magnetic with a spin density wave that is well-defined but with magnetic twin and anti-phase boundaries that are dynamic on the time-scale of experiments. Under this assumption, we find that our calculations can accurately reproduce even very fine details of the structure, and a natural explanation for the temperature separation of structural and magnetic transitions is provided. Thus, our theory restores agreement between experiment and theory in crucial areas, making further cooperative progress possible on both fronts. We believe that fluctuating magnetic domains will be an essential component of unravelling the interplay between magnetic interactions and superconductivity in these newest high Tc superconductors.
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