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Structure and magnetotransport properties of epitaxial nanocomposite La0.67Ca0.33MnO3:SrTiO3 thin films grown by a chemical solution approach

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10 Author(s)
Fei, Ling ; Department of Chemical Engineering, New Mexico State University, Las Cruces, New Mexico 88003, USA ; Zhu, Leyi ; Cheng, Xuemei ; Haiyan Wang
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Epitaxial La0.67Ca0.33MnO3:SrTiO3 (LCMO:STO) composite thin films have been grown on single crystal LaAlO3(001) substrates by a cost effective polymer-assisted deposition method. Both x-ray diffraction and high-resolution transmission electron microscopy confirm the growth of epitaxial films with an epitaxial relationship between the films and the substrates as (002)film||(002)sub and [202]film||[202]sub. The transport property measurement shows that the STO phase significantly increases the resistivity and enhances the magnetoresistance (MR) effect of LCMO and moves the metal-insulator transition to lower temperatures. For example, the MR values measured at magnetic fields of 0 and 3 T are -44.6% at 255 K for LCMO, -94.2% at 125 K for LCMO:3% STO, and -99.4% at 100 K for LCMO:5% STO, respectively.

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Applied Physics Letters  (Volume:100 ,  Issue: 8 )