Nanoscale electronic order in iron pnictides

Details Nanoscale electronic order in iron pnictides Nanoscale electronic order in iron pnictides

2009-12-30

arxiv.org/abs/0912.5495v2

Phys. Rev. Lett. 104, 097001 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1103/PhysRevLett.104.097001

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.

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