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Effect of strain on the electrical conduction in epitaxial films of La0.7Ca0.3MnO3

Paranjape, Mandar and Raychaudhuri, AK and Mathur, ND and Blamire, MG (2003) Effect of strain on the electrical conduction in epitaxial films of La0.7Ca0.3MnO3. In: Physical Review B (Condensed Matter and Materials Physics), 67 . pp. 214415-1.


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We have used scanning tunneling microscopy and potentiometry to study the microstructure and nanoscopic current transport in thin films of La0.7Ca0.3MnO3 grown on SrTiO3 and NdGaO3 substrates. Thin (50 nm) films, which are strained, show step-terrace growth, whereas relatively thicker film (200 nm), which is strain relaxed, shows well-connected grains. Charge transport in these films is inhomogeneous on the scale of nanometers. There are large variations in the local potential at grain boundaries as well as step edges. The value of the average field distribution at grain boundaries and step edges is found to be dependent on the strain in the film. Within the terraces local variations in potentials correlate with the nature of the strain in the film and this gives rise to inhomogeneous current flow in them.

Item Type: Journal Article
Publication: Physical Review B (Condensed Matter and Materials Physics)
Publisher: American Physical Society
Additional Information: The DOI is currently only displayed. Copyright for this article belongs to American Physical Society (APS).
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 17 Sep 2004
Last Modified: 19 Sep 2010 04:16
URI: http://eprints.iisc.ac.in/id/eprint/2051

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