J. Phys.: Condens. Matter 21 (4 November 2009) 442001 (4pp) doi: 10.1088/0953-8984/21/44/442001
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Large anisotropy in colossal magnetoresistance of charge orbital ordered epitaxial
Sm0.5Ca0.5MnO3
films
Y Z Chen1,2, J R Sun1, J L Zhao1, J Wang1, B G Shen1 and N Pryds2
1 State Key Laboratory of Magnetism, Institute of Physics and Beijing National
Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing
100190,
People's Republic of China
2 Fuel cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable
Energy, Technical University of Denmark, DK-4000 Roskilde,
Denmark
E-mail: yunc@risoe.dtu.dk and jrsun@g203.iphy.ac.cnAbstract.
We investigated the structure and magnetotransport properties of
Sm0.5Ca0.5MnO3
(SCMO) films epitaxially grown on (011)-oriented
SrTiO3
substrates, which exhibited clear charge/orbital ordering transition. A significant anisotropy of
~1000
in the colossal magnetoresistance (CMR) effect was observed in the films with a thickness
between 50 and 80 nm, which was distinctly different from the basically isotropic CMR
effect in bulk SCMO. The large anisotropy in the CMR can be ascribed to the intrinsic
asymmetric strain in the film, which plays an important role in tuning the spin–orbit
coupling in manganite films. The origin of the peculiar CMR effect is discussed.
Print publication: Issue 44 (4 November 2009)Received 31 July 2009, in final form 6 September 2009
Published 9 October 2009
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