Sr7-yCayMn4O15: a new structural candidate for exhibiting a multiferroic ground state
Improper ferroelectricity, where the ferroelectric distortion occurs only as a consequence of a phase transition driven by another lattice/electronic instability, opens up new possibilities for playing with a much more diverse crystal and compositional chemistry than is possible in conventional “proper” ferroelectrics. Recent predictions of a new kind of improper ferroelectricity termed “hybrid improper ferroelectricity”, where two lattice instabilities couple together at the phase transition driving a third polar instability, has sparked a flurry of research. Here we request 3 days on D2B to investigate a new series of compounds, Sr7-yCayMn4O15. Our symmetry analysis, observations of site disorder and observations of weak ferromagnetism in the magnetic susceptibility data, all point towards a new kind of multiferroic mechanism whose mechanism we seek to probe here by high resolution neutron PXRD.
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Mark S Senn; CLARKE Gabriel; Fernando Pomiro and RITTER Clemens. (2019). Sr7-yCayMn4O15: a new structural candidate for exhibiting a multiferroic ground state. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-723