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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

84 Scopus citations


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 (US)
Article number172503
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
StatePublished - May 27 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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