Anisotropic transport properties in the phase-separated La_(0.67)Ca_(0.33)MnO_3/NdGaO_3 (001) films |
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| Affiliation: | 1.Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2.Shanxi Key Laboratory of Condensed Matter Structures and Properties, School of Science, Northwestern Polytechnical University, Xi’an 710072, China;3.Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China and High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230026, China |
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| Abstract: | The anisotropic transport property was investigated in a phase separation La_(0.67)Ca_(0.33)MnO_3(LCMO) film grown on(001)-oriented Nd GaO_3(NGO) substrate. It was found that the resistivity along the b-axis is much higher than that along the a-axis. Two resistivity peaks were observed in the temperature dependent measurement along the b-axis, one located at 91 K and the other centered at 165 K. Moreover, we also studied the response of the resistivities along the two axes to various electric currents, magnetic fields, and light illuminations. The resistivities along the two axes are sensitive to the magnetic field. However, the electric current and light illumination can influence the resistivity along the b-axis obviously, but have little effect on the resistivity along the a-axis. Based on these results, we believe that an anisotropicstrain-controlled MnO_6 octahedra shear-mode deformation may provide a mechanism of conduction filaments paths along the a-axis, which leads to the anisotropic transport property. |
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| Keywords: | electronic transport magnetic field electric currents light illuminations |
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