Magnetoelastic Coupling in the Phase Diagram of Ba1-xKxFe2As2

Sevda Avci; Omar Chmaissem; Eugene A. Goremychkin; Stephan Rosenkranz; John-Paul Castellan; Duck-Young Chung; Ilya S. Todorov; John A. Schlueter; Helmut Claus; Mercouri G. Kanatzidis; Aziz Daoud-Aladine; Dmitry Khalyavin; Raymond Osborn

doi:10.1103/PhysRevB.83.172503

Magnetoelastic Coupling in the Phase Diagram of Ba1-xKxFe2As2

Superconductivity 2011-06-30 v1

Authors: Sevda Avci , Omar Chmaissem , Eugene A. Goremychkin , Stephan Rosenkranz , John-Paul Castellan , Duck-Young Chung , Ilya S. Todorov , John A. Schlueter , Helmut Claus , Mercouri G. Kanatzidis , Aziz Daoud-Aladine , Dmitry Khalyavin , Raymond Osborn

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Abstract

We report a high resolution neutron diffraction investigation of the coupling of structural and magnetic transitions in Ba1xKxFe2As2. The tetragonal-orthorhombic and antiferromagnetic transitions are suppressed with potassium-doping, falling to zero at x <~ 0.3. However, unlike Ba(Fe1xCox)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.

Keywords

iron pnictide superconductors magnetoelastic coupling neutron diffraction phase diagram structural transition antiferromagnetic transition

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@article{arxiv.1102.1933,
  title  = {Magnetoelastic Coupling in the Phase Diagram of Ba1-xKxFe2As2},
  author = {Sevda Avci and Omar Chmaissem and Eugene A. Goremychkin and Stephan Rosenkranz and John-Paul Castellan and Duck-Young Chung and Ilya S. Todorov and John A. Schlueter and Helmut Claus and Mercouri G. Kanatzidis and Aziz Daoud-Aladine and Dmitry Khalyavin and Raymond Osborn},
  journal= {arXiv preprint arXiv:1102.1933},
  year   = {2011}
}

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4 pages, 5 figures

Magnetoelastic Coupling in the Phase Diagram of Ba1-xKxFe2As2

Abstract

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