Magnetoelastic coupling in the phase diagram of Ba1-xK xFe2As2 as seen via neutron diffraction

S. Avci, O. Chmaissem, E. A. Goremychkin, S. Rosenkranz, J. P. Castellan, D. Y. Chung, I. S. Todorov, J. A. Schlueter, H. Claus, M. G. Kanatzidis, A. Daoud-Aladine, D. Khalyavin, R. Osborn

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76 Citations (Scopus)


We report a high resolution neutron diffraction investigation of the coupling of structural and magnetic transitions in Ba1-xK xFe2As2. The tetragonal-orthorhombic and antiferromagnetic transitions are suppressed with potassium doping, falling to zero at x Fe1-xCox)2As2, the two transitions are first order and coincident over the entire phase diagram, with a biquadratic coupling of the two order parameters. The phase diagram is refined showing that the onset of superconductivity is at x=0.133 with all three phases coexisting until x≤0.24.

Original languageEnglish
Article number172503
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - May 27 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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