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Magnetic structure of an incommensurate phase of La-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BiFe</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sc</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>: Role of antisymmetric exchange interactions
A 20% substitution of Bi with La in the perovskite ${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{Fe}}_{0.5}{\mathrm{Sc}}_{0.5}{\mathrm{O}}_{3}$ system obtained under high-pressure and high-temperature conditions has been found to induce an incommensurately modulated structural phase. The room-temperature x-ray and neutron powder diffraction patterns of this phase were successfully refined using the $Imma(0,0,\ensuremath{\gamma})s00$ superspace group ($\ensuremath{\gamma}=0.534(3)$) with the …