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APS -APS March Meeting 2017 - Event - Nematicity and Spin Fluctuations in the Iron Pnictide Superconductors Studied by NMR

机译:APS -APS 2017年3月会议-事件-通过NMR研究的铁离子超导体的向列性和自旋涨落

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The iron pnictide superconductors exhibit rich phase diagrams with both nematic and magnetic ordering as well as unconventional superconductivity. These phases can be probed by As-75 NMR, which is sensitive to both magnetic and quadrupolar degrees of freedom. We show that the spin-lattice relaxation rate probes both the dynamical electron spin susceptibility as well as the dynamical nematic susceptibility in the Ba(Fe,Co)$_2$As$_2$ and BaFe$_2$(As,P)$_2$ system. A ubiquitous feature of the NMR in the doped systems, however, is the presence of glassy relaxation. We show that this behavior is connected to the large nematic susceptibility in these materials, and the presence of quenched random order. We further present new data on detwinned crystals under uniaxial strain, which uncovers the intrinsic anisotropy of the spin fluctuations in the nematic phase.
机译:锡铁超导体显示出丰富的相图,具有向列和磁有序性以及非常规的超导性。这些相可以通过对磁性和四极自由度都敏感的As-75 NMR进行探测。我们显示,自旋晶格弛豫率探测了Ba(Fe,Co)$ _ 2 $ As $ _2 $和BaFe $ _2 $(As,P)$ _ 2中的动态电子自旋磁化率以及动态向列磁化率$系统。但是,在掺杂体系中NMR的普遍特征是玻璃态弛豫的存在。我们表明,这种行为与这些材料中的大向列磁化率有关,并且与淬灭的随机顺序有关。我们进一步提出了单轴应变下的解缠晶体的新数据,该数据揭示了向列相中自旋涨落的固有各向异性。

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