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Strong coupling between magnetic and structural order parameters in SrFe2As2

A. Jesche, N. Caroca-Canales, H. Rosner, H. Borrmann, A. Ormeci, D. Kasinathan, H. H. Klauss, H. Luetkens, R. Khasanov, A. Amato, A. Hoser, K. Kaneko, C. Krellner, and C. Geibel
Phys. Rev. B 78, 180504(R) – Published 13 November 2008

Abstract

X-ray and muon spin-relaxation experiments performed on SrFe2As2 polycrystals confirm a sharp first-order transition at T0=205K corresponding to an orthorhombic phase distortion and to a commensurate antiferromagnetic Fe ordering with a larger distortion and larger size of the ordered moment than reported for BaFe2As2. The structural and the magnetic order parameters present a remarkable similarity in their temperature dependence from T0 down to low temperatures, showing that both phenomena are intimately connected. Accordingly, the size of the ordered Fe moments scales with the lattice distortion when going from SrFe2As2 to BaFe2As2. Full-potential band-structure calculations confirm that the columnar magnetic order with propagation vector (1,0,1) and the orthorhombic lattice distortion are intrinsically tied to each other.

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  • Received 4 July 2008

DOI:https://doi.org/10.1103/PhysRevB.78.180504

©2008 American Physical Society

Authors & Affiliations

A. Jesche1, N. Caroca-Canales1, H. Rosner1, H. Borrmann1, A. Ormeci1, D. Kasinathan1, H. H. Klauss2, H. Luetkens3, R. Khasanov3, A. Amato3, A. Hoser4, K. Kaneko1,5, C. Krellner1, and C. Geibel1,*

  • 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • 2IFP, TU-Dresden, D-01069 Dresden, Germany
  • 3Laboratory for Muon-Spin Spectroscopy, Paul-Scherrer-Institute, CH-5232 Villigen, Switzerland
  • 4Hahn-Meitner-Institute, D-14109 Berlin, Germany
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

  • *geibel@cpfs.mpg.de

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Issue

Vol. 78, Iss. 18 — 1 November 2008

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