Magnetoelastic coupling in the phase diagram of Ba${}_{1\ensuremath{-}x}$K${}_{x}$Fe${}_{2}$As${}_{2}$ as seen via neutron diffraction

Magnetoelastic coupling in the phase diagram of Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ 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, and R. Osborn

Phys. Rev. B 83, 172503 – Published 27 May 2011

Abstract

We report a high resolution neutron diffraction investigation of the coupling of structural and magnetic transitions in Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ . The tetragonal-orthorhombic and antiferromagnetic transitions are suppressed with potassium doping, falling to zero at $x ≲ 0.24$ . However, unlike Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ , 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 $x ⩽ 0.24$ .

Received 11 February 2011

DOI:https://doi.org/10.1103/PhysRevB.83.172503

Authors & Affiliations

S. Avci¹, O. Chmaissem^1,2, E. A. Goremychkin¹, S. Rosenkranz¹, J.-P. Castellan¹, D. Y. Chung¹, I. S. Todorov¹, J. A. Schlueter¹, H. Claus¹, M. G. Kanatzidis^1,3, A. Daoud-Aladine⁴, D. Khalyavin⁴, and R. Osborn¹

¹Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
²Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA
³Department of Chemistry, Northwestern University, Evanston, IL 60208-3113, USA
⁴ISIS Pulsed Neutron and Muon Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

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Vol. 83, Iss. 17 — 1 May 2011

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Physical Review B

covering condensed matter and materials physics

Magnetoelastic coupling in the phase diagram of Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ 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, and R. Osborn

Phys. Rev. B 83, 172503 – Published 27 May 2011

Abstract

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Physical Review B

covering condensed matter and materials physics

Magnetoelastic coupling in the phase diagram of Ba1−xKxFe2As2 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, and R. Osborn

Phys. Rev. B 83, 172503 – Published 27 May 2011

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Magnetoelastic coupling in the phase diagram of Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ as seen via neutron diffraction