Nanoscale Electronic Order in Iron Pnictides

G. Lang, H.-J. Grafe, D. Paar, F. Hammerath, K. Manthey, G. Behr, J. Werner, and B. Büchner
Phys. Rev. Lett. 104, 097001 – Published 3 March 2010

Abstract

The charge distribution in RFeAsO1xFx (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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  • Received 21 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.097001

©2010 American Physical Society

Authors & Affiliations

G. Lang1,*, H.-J. Grafe1, D. Paar1,2, F. Hammerath1, K. Manthey1, G. Behr1, J. Werner1, and B. Büchner1

  • 1IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany
  • 2Department of Physics, Faculty of Science, University of Zagreb, P.O. Box 331, HR-10002 Zagreb, Croatia

  • *g.m.lang@ifw-dresden.de

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Vol. 104, Iss. 9 — 5 March 2010

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