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arXiv 1608.04532cond-mat.supr-concond-mat.str-el
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RbFe $_2$ As $_2$电荷有序相中电子相分离产生的超导电性

Superconductivity emerging from an electronic phase separation in the charge ordered phase of RbFe$_2$As$_2$

E. Civardi, M. Moroni, M. Babij, Z. Bukowski, P. Carretta

摘要:

本文报道了RbFe $_2$ As $_2$铁基超导体中$^{75}$ As、$^{87}$ Rb和$^{85}$ Rb的核四极共振(NQR)和$^{87}$ Rb的核磁共振(NMR)测量。我们观察到一个显着的$^{75}$作为NQR谱的展宽低于$T_0\simeq 140$ K,这是与发病的FeAs平面的电荷顺序。低于$T_0$,我们观察到$^{75}$ As核自旋-晶格弛豫速率下降到$T^*\simeq 20$ K的幂律下降。低于这个温度,原子核开始探测不同的动力学,这是由于电荷序引起的不同的局部电子构型。一部分的核探针自旋动力学与电子接近本地化,而另一部分探针激活动力学可能与赝能隙。这些不同的趋势进行了讨论,在光的轨道选择性行为预期的电子相关性。

英文摘要:

$^{75}$As, $^{87}$Rb and $^{85}$Rb nuclear quadrupole resonance (NQR) and $^{87}$Rb nuclear magnetic resonance (NMR) measurements in RbFe$_2$As$_2$ iron-based superconductor are presented. We observe a marked broadening of $^{75}$As NQR spectrum below $T_0\simeq 140$ K which is associated with the onset of a charge order in the FeAs planes. Below $T_0$ we observe a power-law decrease in $^{75}$As nuclear spin-lattice relaxation rate down to $T^*\simeq 20$ K. Below that temperature the nuclei start to probe different dynamics owing to the different local electronic configurations induced by the charge order. A fraction of the nuclei probes spin dynamics associated with electrons approaching a localization while another fraction probes activated dynamics possibly associated with a pseudogap. These different trends are discussed in the light of an orbital selective behaviour expected for the electronic correlations.

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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