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A 20% substitution of Bi with La in the perovskite Bi1-xLaxFe0.5Sc0.5O3system obtained under high-pressure and high-temperature conditions has beenfound to induce an incommensurately modulated structural phase. The roomtemperature X-ray and neutron powder diffraction patterns of this phase weresuccessfully refined using the Imma(0,0,g)s00 superspace group (g=0.534(3))with the modulation applied to Bi/La- and oxygen displacements. The modulatedstructure is closely related to the prototype antiferroelectric structure ofPbZrO3 which can be considered as the lock-in variant of the latter with g=0.5. Below T_N = 220 K, the neutron diffraction data provide evidence for along-range G-type antiferromagnetic ordering commensurate with the average Immastructure. Based on a general symmetry consideration, we show that thedirection of the spins is controlled by the antisymmetric exchange imposed bythe two primary structural distortions, namely oxygen octahedral tilting andincommensurate atomic displacements. The tilting is responsible for the onsetof a weak ferromagnetism, observed in magnetization measurements, whereas theincommensurate displacive mode is dictated by the symmetry to couple aspin-density wave. The obtained results demonstrate that antisymmetric exchangeis the dominant anisotropic interaction in Fe3+ based distorted perovskiteswith a nearly quenched orbital degree of freedom.

Magnetic structure of an incommensurate phase of La-doped BiFe0.5Sc0.5O3: Role of antisymmetric exchange interactions