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Helimagnetic materials are identified as promising for novel spintronicapplications. Since helical spin order is manifested as a compromise ofcompeting magnetic exchange interactions, its emergence is limited by uniqueconstraints imposed by the crystalline lattice and the interaction geometries,as exemplified by the multiferroic perovskite manganites with largeorthorhombic distortion. Here we show that a simple cubic perovskite SrCoO$_3$with room-temperature ferromagnetism has the potential to host helimagneticorder upon isotropic lattice expansion. Increasing the Ba content $x$ inSr$_{1-x}$Ba$_x$CoO$_3$ continuously expands the cubic lattice, eventuallysuppressing the ferromagnetic order near $x$=0.4, where helimagneticcorrelations are observed as incommensurate diffuse magnetic scattering byneutron diffraction measurements. The emergence of helimagnetism issemi-quantitatively reproduced by first-principles calculations, leading to theconjecture that a simple cubic lattice with strong $d$-$p$ hybridisation canexhibit a variety of novel magnetic phases originating from competing exchangeinteractions.

Negative-pressure-induced helimagnetism in ferromagnetic cubic perovskites Sr$_{1-x}$Ba$_{x}$CoO$_{3}$