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Journal of Electron Microscopy 51:S155-S158 (2002)
© 2002 Oxford University Press

Full-length paper

Dark-field and bright-field imaging of charge order domains in Nd0.5Ca0.5(Mn0.98Cr0.02)O3

Jun Xu1, Yoshio Matsui1,*, Tsuyoshi Kimura2 and Yoshinori Tokura2

1National Institute for Materials Science, Namiki 1-1, Tsukuba 305-0044 and
2Joint Research Center for Atom Technology, Tsukuba 305-0046, Japan

To whom correspondence should be addressed. E-mail: MATSUI.Yoshio{at}nims.go.jp

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.

Keywords     manganites, charge order, electronic phase separation, commensurate, incommensurate, antiphase boundary


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