Oxygen-driven anisotropic transport in ultra-thin manganite films

Baomin Wang, Lu You, Peng Ren, Xinmao Yin, Yuan Peng, Bin Xia, Lan Wang, Xiaojiang Yu, Sock Mui Poh, Ping Yang, Guoliang Yuan, Lang Chen, Andrivo Rusydi () and Junling Wang ()
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Baomin Wang: School of Materials Science and Engineering, Nanyang Technological University
Lu You: School of Materials Science and Engineering, Nanyang Technological University
Peng Ren: School of Physical and Mathematical Sciences, Nanyang Technological University
Xinmao Yin: NUSNNI-NanoCore, National University of Singapore
Yuan Peng: School of Materials Science and Engineering, Nanyang Technological University
Bin Xia: School of Physical and Mathematical Sciences, Nanyang Technological University
Lan Wang: School of Physical and Mathematical Sciences, Nanyang Technological University
Xiaojiang Yu: Singapore Synchrotron Light Source (SSLS), National University of Singapore
Sock Mui Poh: Singapore Synchrotron Light Source (SSLS), National University of Singapore
Ping Yang: Singapore Synchrotron Light Source (SSLS), National University of Singapore
Guoliang Yuan: Nanjing University of Science and Technology
Lang Chen: School of Materials Science and Engineering, Nanyang Technological University
Andrivo Rusydi: NUSNNI-NanoCore, National University of Singapore
Junling Wang: School of Materials Science and Engineering, Nanyang Technological University

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Transition metal oxides have a range of unique properties due to coupling of charge, spin, orbital and lattice degrees of freedom and nearly degenerate multiple ground states. These properties make them interesting for applications and for fundamental investigations. Here we report a new phase with abnormal transport anisotropy in La0.7Sr0.3MnO3 ultra-thin films under large tensile strain. This anisotropy is absent in films under smaller tensile strain or compressive strain. Furthermore, thickness and magnetic-field-dependent experiments suggest that the tensile-strain-induced two-dimensional character is crucial for the observed phenomena. X-ray absorption spectroscopy results indicate that this anisotropy is likely driven by O 2p orbital, which hybridizes with Mn 3d. Ab initio calculations confirm this result. Our results may help to understand the anisotropic transport behaviour observed in other systems.

Date: 2013
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DOI: 10.1038/ncomms3778

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