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Magnetic and structural transitions in layered iron arsenide systems: AFe2As2 versus RFeAsO

C. Krellner, N. Caroca-Canales, A. Jesche, H. Rosner, A. Ormeci, and C. Geibel
Phys. Rev. B 78, 100504(R) – Published 5 September 2008

Abstract

Resistivity, specific-heat, and magnetic-susceptibility measurements performed on SrFe2As2 samples evidence a behavior very similar to that observed in LaFeAsO and BaFe2As2, with the difference being that the formation of the spin-density wave and the lattice deformation occur in a pronounced first-order transition at T0=205K. Comparing further data evidences that the Fe magnetism is stronger in SrFe2As2 and in EuFe2As2 than in the other layered FeAs systems investigated up to now. Full potential local-density approximation band-structure calculations confirm the large similarity between the compounds, especially for the relevant low energy Fe3d states. The relation between structural details and magnetic order is analyzed.

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  • Received 6 June 2008

DOI:https://doi.org/10.1103/PhysRevB.78.100504

©2008 American Physical Society

Authors & Affiliations

C. Krellner, N. Caroca-Canales, A. Jesche, H. Rosner, A. Ormeci, and C. Geibel*

  • Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

  • *geibel@cpfs.mpg.de

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Issue

Vol. 78, Iss. 10 — 1 September 2008

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