Nanoscale Electronic Order in Iron Pnictides

G. Lang, H.-J. Grafe, D. Paar, F. Hammerath, K. Manthey, G. Behr, J. Werner, B. Büchner
2010 Physical Review Letters  
The charge distribution in RFeAsO_1-xF_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
more » ... h-doping-like regions would coexist. Implications for the interplay of static magnetism and superconductivity are discussed.
doi:10.1103/physrevlett.104.097001 pmid:20367004 fatcat:cm2jckccwfd57lt7wcjgrjeckq