Intermediate magnetic phase of the magnetoelectric compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant="normal">Ca</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Sr</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mi mathvariant="normal">BaCo</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:math> described with the superspace formalism
Physical review. B./Physical review. B