Modulated spin helicity stabilized by incommensurate orbital density waves in a quadruple perovskite manganite
Modulated spin helicity stabilized by incommensurate orbital density waves in a quadruple perovskite manganite
Through a combination of neutron diffraction and Landau theory we describe the spin ordering in the ground state of the quadruple perovskite manganite ${\mathrm{CaMn}}_{7}{\mathrm{O}}_{12}$---a magnetic multiferroic supporting an incommensurate orbital density wave that onsets above the magnetic ordering temperature, ${T}_{\mathrm{N}1}=90$ K. The multi-$\mathbf{k}$ magnetic structure in the ground state was …