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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
; | | Date: |
16 Aug 2016 | | Abstract: | $^{75}$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 $T_0simeq 140$ 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. | | Source: | arXiv, 1608.4532 | | Services: | Forum | Review | PDF | Favorites | |
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