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arXiv 1012.3254cond-mat.str-elcond-mat.supr-con
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反铁磁铁磷属化合物的双磁振子拉曼散射理论

Theory of two magnon Raman scattering in antiferromagnetic iron pnictides

C. -C. Chen, C. J. Jia, A. F. Kemper, R. R. P. Singh, T. P. Devereaux

摘要:

虽然铁基磷属元素化物和硫属元素化物的母体是巡游反铁磁体,但利用局域矩图来理解它们的磁性仍然是普遍的。我们研究磁拉曼散射从本地矩的角度来看,各种量子自旋模型提出了这类新的超导体。这些模型在磁挫折的水平上变化很大,并显示出截然不同的两个磁振子拉曼响应。因此,光散射的两个磁振子激发提供了一个强大的和独立的措施,潜在的自旋相互作用。与其他最近的实验结果一致,我们的结果表明,在这些系统中的磁挫折量可能很小。

英文摘要:

Although the parent iron-based pnictides and chalcogenides are itinerant antiferromagnets, the use of local moment picture to understand their magnetic properties is still widespread. We study magnetic Raman scattering from a local moment perspective for various quantum spin models proposed for this new class of superconductors. These models vary greatly in the level of magnetic frustration and show a vastly different two-magnon Raman response. Light scattering by two-magnon excitations thus provides a robust and independent measure of the underlying spin interactions. In accord with other recent experiments, our results indicate that the amount of magnetic frustration in these systems may be small.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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