Abstract

Low temperature transmission electron microscopy observation is conducted to study the charge ordering (CO) progress and electronic phase separation in Nd0.5Ca0.5Mn0.98Cr0.02O3. At 130 K, there is a commensurate‐to‐incommensurate (C‐IC) type CO transition with increasing temperature. Dark‐field images show the coexistence of CO and ferromagnetic (FM) domains. The FM domains are only a few nanometres in size, whereas the CO domains are from many tens of nanometres to over 100 nm in size below 130 K and sharply drop to only several nanometres at 130 K. The incommensurability evolves from the commensurate CO phase, which is manifested by the local 3a (a ∼5.4Å) configuration at the end of antiphase boundary (APB). The C‐IC CO transition is related to the increasing of local 3a configuration as APB increases with temperature, which at 130 K finally destroys the long‐range double periodicity in commensurate phase and leads to short‐range quasi double‐periodicity in incommensurate phase. It is anticipated that APB might also be the nucleation place for the FM nanodomains.

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