Nanoscale electronic order in iron pnictides.
The charge distribution in RFeAsO1-xFx (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.
Lang
G
G
IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany. g.m.lang@ifw-dresden.de
Grafe
H-J
HJ
Paar
D
D
Hammerath
F
F
Manthey
K
K
Behr
G
G
Werner
J
J
Büchner
B
B