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Epitaxial-strain effect on charge/orbital order in Pr0.5Ca0.5MnO3 films

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arxiv 0908.4573 v1 pith:NCEL7Q62 submitted 2009-08-31 cond-mat.str-el

Epitaxial-strain effect on charge/orbital order in Pr0.5Ca0.5MnO3 films

D. Okuyama , M. Nakamura , Y. Wakabayashi , H. Itoh , R. Kumai , H. Yamada , Y. Taguchi , T. Arima
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M. Kawasaki Y. Tokura
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classification cond-mat.str-el
keywords filmco-oolsataroundeffectepitaxialfilmsgrown
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Effect of growth orientation on charge- and orbital-ordering (CO-OO) phenomena has been studied for Pr0.5Ca0.5MnO3 epitaxial thin films fabricated on (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates by means of resistivity, synchrotron x-ray diffraction, and polarized optical microscopy measurements. CO-OO transition is observed around 220 K for a film grown on an LSAT (011) substrate ((011)-film), similarly to a bulk sample, while a film grown on a (001) plane of LSAT ((001)-film) shows much higher transition temperature around 300 K. The domain size of OO is approximately 3 times as large in the (011)-film as in the (001)-film. These results demonstrate that various properties of CO-OO phenomena can be controlled with the growth orientation via the epitaxial strain from the substrate.

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