Nature and evolution of incommensurate charge order in manganites visualized with cryogenic scanning transmission electron microscopy.

ABSTRACT: Incommensurate charge order in hole-doped oxides is intertwined with exotic phenomena such as colossal magnetoresistance, high-temperature superconductivity, and electronic nematicity. Here, we map, at atomic resolution, the nature of incommensurate charge-lattice order in a manganite using scanning transmission electron microscopy at room temperature and cryogenic temperature ([Formula: see text]93 K). In diffraction, the ordering wave vector changes upon cooling, a behavior typically associated with incommensurate order. However, using real space measurements, we discover that the ordered state forms lattice-locked regions over a few wavelengths interspersed with phase defects and changing periodicity. The cations undergo picometer-scale ([Formula: see text]6 pm to 11 pm) transverse disp

SUBMITTER: El Baggari I 

PROVIDER: S-EPMC5816166 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature