Nanoscale Electronic Order in Iron Pnictides

The charge distribution in RFeAsO(1-x)F(x) (R = La; Sm) iron pnictides is probed using As nuclear quadrupole resonance. Whereas undoped and optimally doped or overdoped compounds feature a single charge environment, two charge environments are detected in the underdoped region. Spin-lattice relaxation measurements show their coexistence at the nanoscale. Together with the quantitative variations of the spectra with doping, they point to a local electronic order in the iron layers, where low-and high-doping-like regions would coexist. Implications for the interplay of static magnetism and superconductivity are discussed.