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
TL;DR
This study uses neutron diffraction to explore how structural and magnetic transitions in Ba1-xKxFe2As2 are coupled and how they evolve with potassium doping, revealing first-order transitions and phase coexistence.
Contribution
It provides detailed insights into the coupling of structural, magnetic, and superconducting phases in Ba1-xKxFe2As2, highlighting the first-order nature of transitions and phase coexistence.
Findings
Transitions are suppressed with doping and vanish near x~0.3.
Structural and magnetic transitions are first-order and coincident across the phase diagram.
Superconductivity begins at x=0.133 with coexistence of phases until x~0.24.
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.
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