Local antiferromagnetic correlations in the iron pnictide superconductors LaFeAsO1xFx and Ca(Fe1xCox)2As2 as seen via normal-state susceptibility

R. Klingeler, N. Leps, I. Hellmann, A. Popa, U. Stockert, C. Hess, V. Kataev, H.-J. Grafe, F. Hammerath, G. Lang, S. Wurmehl, G. Behr, L. Harnagea, S. Singh, and B. Büchner
Phys. Rev. B 81, 024506 – Published 11 January 2010

Abstract

We have studied the interplay of magnetism and superconductivity in LaFeAsO1xFx and Ca(Fe1xCox)2As2. While antiferromagnetic spin-density wave formation is suppressed and superconductivity evolves, all samples show a doping-independent strong increase in the normal-state susceptibility upon heating which appears a general feature of iron pnictides. The data provide evidence for robust local antiferromagnetic correlations persisting even in the superconducting regime of the phase diagram.

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  • Received 5 August 2008

DOI:https://doi.org/10.1103/PhysRevB.81.024506

©2010 American Physical Society

Authors & Affiliations

R. Klingeler, N. Leps, I. Hellmann, A. Popa, U. Stockert, C. Hess, V. Kataev, H.-J. Grafe, F. Hammerath, G. Lang, S. Wurmehl, G. Behr, L. Harnagea, S. Singh, and B. Büchner

  • Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany

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Issue

Vol. 81, Iss. 2 — 1 January 2010

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