Antiferromagnetic ordering and structural phase transition in Ba2Fe2As2 with Sn incorporated from the growth flux

Y. Su, P. Link, A. Schneidewind, Th. Wolf, P. Adelmann, Y. Xiao, M. Meven, R. Mittal, M. Rotter, D. Johrendt, Th. Brueckel, and M. Loewenhaupt
Phys. Rev. B 79, 064504 – Published 3 February 2009

Abstract

Antiferromagnetic ordering and structural phase transition have been investigated via comprehensive neutron and x-ray diffraction on Sn-flux-grown BaFe2As2 single crystals, the A122 family of FeAs-based high-TC superconductor compounds. The incorporation of Sn in the lattice resulted to an average composition of Ba0.95Sn0.05Fe2As2. A tetragonal-to-orthorhombic structural phase transition and a three-dimensional long-range antiferromagnetic ordering of the iron magnetic moment, with a unique magnetic propagation wave vector k=(1,0,1) have been found to take place at 90K. The magnetic moments of iron are aligned along the longer a axis in the low-temperature orthorhombic phase (Fmmm with b<a<c). Our results thus demonstrate that the magnetic structure of the Sn-flux-grown BaFe2As2 single crystal is the same as those in the polycrystalline samples and in other A122 iron pnictides compounds. We argue that the Sn incorporation in the lattice is responsible for a smaller orthorhombic splitting and lower Néel temperature TN observed in the experiments.

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  • Received 8 August 2008

DOI:https://doi.org/10.1103/PhysRevB.79.064504

©2009 American Physical Society

Authors & Affiliations

Y. Su1,*, P. Link2, A. Schneidewind3, Th. Wolf4, P. Adelmann4, Y. Xiao5, M. Meven2, R. Mittal1,6, M. Rotter7, D. Johrendt7, Th. Brueckel1,5, and M. Loewenhaupt3

  • 1Juelich Centre for Neutron Science, IFF, Forschungszentrum Juelich, Outstation at FRM II, Lichtenbergstrasse 1, D-85747 Garching, Germany
  • 2FRM II, Technische Universitaet Muenchen, Lichtenbergstrasse 1, D-85747 Garching, Germany
  • 3Institut fuer Festkoerperphysik, Technische Universitaet Dresden, D-01062 Dresden, Germany
  • 4Forschungszentrum Karlsruhe, Institut fuer Festkoerperphysik, D-76021 Karlsruhe, Germany
  • 5Institut fuer Festkoerperforschung, Forschungszentrum Juelich, D-52425 Juelich, Germany
  • 6Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
  • 7Department Chemie und Biochemie, Ludwig-Maximilians-Universitaet Muenchen, Butenandtstrasse 5-13 (Haus D), D-81377 Muenchen, Germany

  • *y.su@fz-juelich.de

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Vol. 79, Iss. 6 — 1 February 2009

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