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Journal of Electron Microscopy 48(4): 381-385 (1999)
© 1999 Oxford University Press

Transmission electron microscopy of La0.7Ca0.3 MnO3 CMR films

Masashi Arita1,*, Akira Sasaki1, Kouichi Hamada1, Akira Okada1, Jun Hayakawa2, Hidefumi Asano2, Masaaki Matsui2 and Heishichiro Takahashi3

1Graduate School of Engineering, Hokkaido University Sapporo 060-8628, Japan
2Graduate School of Engineering, Nagoya University Nagoya 464-8603, Japan
3Center for Advance Research of Energy Technology, Hokkaido University Sapporo 060-8628, Japan

*To whom correspondence should be addressed. E-mail: arita{at}nano.eng.hokudai.ac.jp

The microstructure of La0 La0.7Ca0.3 MnO3 (LCMO) films grown on (001) surfaces of various cubic or pseudo-cubic substrates (MgO, SrTiO3, LaSrGaO4 and YA1O3) was studied by means of transmission electron microscopy. The epitaxy was mainly (001)p[100]p//(001)s[100]s (p: perovskite primitive cell; s: substrate). The film on MgO contained many planar defects and intergrown grains which originated at the substrate surface. The film on STO was composed of one crystallographic-type domain but having a twin structure, while films on the other substrates showed the ‘three-domain’ structure where the perovskite primitive lattice continued throughout the area observed.

Keywords     high resolution TEM, La-Ca-Mn-O, colossal magnetoresistance, thin film, microstructure, epitaxy

Received     30 November 1998, accepted 8 January 1999


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