Superconductivity emerging from an electronic phase separation in the charge ordered phase of RbFeAs
arXiv:1608.04532 · doi:10.1103/PhysRevLett.117.217001
Abstract
As, Rb and Rb nuclear quadrupole resonance (NQR) and Rb nuclear magnetic resonance (NMR) measurements in RbFeAs iron-based superconductor are presented. We observe a marked broadening of As NQR spectrum below K which is associated with the onset of a charge order in the FeAs planes. Below we observe a power-law decrease in As nuclear spin-lattice relaxation rate down to 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.
5 pages, 3 figures and 4 pages of supplemental material
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