Nano Archive

Effect of grain boundaries on the local electronic transport in nanostructured films of colossal magnetoresistive manganites

Kar, Sohini and Sarkar, Jayanta and Ghosh, Barnali and Raychaudhuri, A. K. (2007) Effect of grain boundaries on the local electronic transport in nanostructured films of colossal magnetoresistive manganites. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 7 (6). pp. 2051-2054. ISSN 1533-4880

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Abstract

We have studied the spatially resolved local electronic properties of nanostructured films of a colossal magnetoresistive (CMR) material by local conductance mapping (LCMAP) using a variable temperature scanning tunneling microscope (STM), as a function of temperature and magnetic field. The experiments were carried out on nanostructured (NS) films of rare-earth hole doped manganites like La0.67Sr0.33MnO3 (LSMO), (prepared by Chemical Solution Deposition (CSD)) having average grain sizes around 100 nm or less. Due to the presence of a large number of natural grain boundaries (GBs), these films exhibit interesting transport properties that are not observed in single crystals and epitaxial films of the same composition, such as low field magnetoresistance (LFMR), and significant MR at higher fields over the entire temperature range. Spatially resolved measurements of electronic properties, like the LCMAP, traces the contribution of the grain boundaries to the electronic transport in these NS films. It is found that the application of a low magnetic field enhances the DOS in the GB region, leading to the observed low field response of the MR.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Functional and hybrid materials
Physical Science > Nanoelectronics
Physical Science > Nanomagnetics
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3917
Deposited By:JNCASR
Deposited On:27 Jan 2009 04:09
Last Modified:18 Apr 2009 11:21

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