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Electron-hopping modes in NiMn2O4+δ materials.

Schmidt, R. and Basu, A. and Brinkman, A. W. and Klusek, Z. and Datta, P. K. (2005) 'Electron-hopping modes in NiMn2O4+δ materials.', Applied physics letters., 86 (7). 073501.

Abstract

The resistance versus temperature (R-T) characteristics of NiMn2O4+delta thermistors have been analyzed. In the literature, electron transport in manganate spinels is commonly described by a small-polaron model for nearest neighbor hopping, but variable range hopping (VRH) has not been considered so far. In this study differentiated R-T data were analyzed, allowing a clear distinction between different modes of hopping. In pressed pellets and thick screen printed films conduction was well described by a VRH model for a parabolic density of states, which was confirmed by scanning tunneling spectroscopy.

Item Type:Article
Keywords:VRH, NNH, R-T characteristics, Thick films, sputtered films, STS.
Full text:PDF - Published Version (69Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.1866643
Publisher statement:Copyright (2005) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. Schmidt, R. and Basu, A. and Brinkman, A. W. and Klusek, Z. and Datta, P. K. (2005) 'Electron-hopping modes in NiMn2O4+δ materials.', Applied physics letters., 86 (7). 073501. and may be found at http://link.aip.org/link/?apl/86/073501
Record Created:04 Dec 2006
Last Modified:21 Apr 2011 13:20

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