Emergent phenomena between the CE-type and G-type orbital ordered ground states of Hg1-xNaxMn3Mn4O12

Colossal magnetoresistance (CMR) in manganite perovskites has been extensively investigated, with key region at x = 3/8 in La1-xCaxMnO3 exhibiting the maximum MR effect. However, there is no consensus on the atomistic-level understanding of the orbital ordered state at this doping level. Recently, using a prototype based on CaMn3Mn4O12, we have revealed a new kind of orbital order at this critical doping level consisting of stripes of orbital ordered and charge disorder, providing the missing intermediate state between CE-type insulating, and FM metallic, phases. On the other hand, a completely distinct multiferroic ground state arising from charge-transfer and G-type orbital order, is found in HgMn3Mn4O12. It is surprising that substitution of Ca cations with isovalent Hg gives rise to such dramatic changes in physical properties. Here we propose a high resolution PXRD investigation of the rich orbital and charge ordered structures that span the solid solution Hg1-xNaxMn3Mn4O12.