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Tetragonal magnetic phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ba</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>โ</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">K</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>from x-ray and neutron diffraction
Combined neutron and x-ray diffraction experiments demonstrate the formation of a low-temperature minority magnetic tetragonal phase in ${\mathrm{Ba}}_{0.76}{\mathrm{K}}_{0.24}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ in addition to the majority magnetic, orthorhombic phase. The coincident enhancement in the magnetic ($\frac{1}{2} \frac{1}{2}$ 1) peaks shows that this minority phase is of the same type that was observed in โฆ