Charge and Orbital Order Patterns in an A-Site Ordered Perovskite-Type Manganite SmBaMn2O6 Determined by Convergent-Beam Electron Diffraction

Charge and orbital ordered (COO) phases of an A-site ordered perovskite-type manganite SmBaMn2O6 have been investigated using convergent- beam electron diffraction. The space groups of the room-temperature and lowtemperature COO phases are revealed to be Pnam and P2(1)am, respectively. Based on the space groups, the COO patterns are unambiguously determined. The noncentrosymmetric space group of the low-temperature phase emerging with the re-arrangement of charge and orbitals are revealed.