Magnetoelastic coupling in the phase diagram of Ba1−xKxFe2As2as seen via neutron diffraction

Autor:	Raymond Osborn, Stephan Rosenkranz, Duck Young Chung, Omar Chmaissem, Mercouri G. Kanatzidis, Eugene Goremychkin, John-Paul Castellan, Dmitry D. Khalyavin, I. S. Todorov, John A. Schlueter, Aziz Daoud-Aladine, Sevda Avci, Helmut Claus
Rok vydání:	2011
Předmět:	Superconductivity Physics Condensed matter physics Doping Resolution (electron density) Neutron diffraction Antiferromagnetism Order (ring theory) Condensed Matter Physics Coupling (probability) Electronic Optical and Magnetic Materials Phase diagram
Zdroj:	Physical Review B. 83
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.83.172503
Popis:	We report a high resolution neutron diffraction investigation of the coupling of structural and magnetic transitions in Ba${}_{1\ensuremath{-}x}$K${}_{x}$Fe${}_{2}$As${}_{2}$. The tetragonal-orthorhombic and antiferromagnetic transitions are suppressed with potassium doping, falling to zero at $x\ensuremath{\lesssim}0.24$. However, unlike Ba(Fe${}_{1\ensuremath{-}x}$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 $x\ensuremath{\leqslant}0.24$.
Databáze:	OpenAIRE
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