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Electron-hopping modes in NiMn₂O<SUB>4+δ</SUB> materials

Schmidt, R.; Basu, A.; Brinkman, A.W.; Klusek, Z.; Datta, P.K.

Electron-hopping modes in NiMn₂O<SUB>4+δ</SUB> materials Thumbnail


Authors

R. Schmidt

A. Basu

A.W. Brinkman

Z. Klusek

P.K. Datta



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.

Citation

Schmidt, R., Basu, A., Brinkman, A., Klusek, Z., & Datta, P. (2005). Electron-hopping modes in NiMn₂O4+δ materials. Applied Physics Letters, 86(7), https://doi.org/10.1063/1.1866643

Journal Article Type Article
Publication Date Feb 14, 2005
Deposit Date Dec 4, 2006
Publicly Available Date Apr 21, 2011
Journal Applied Physics Letters
Print ISSN 0003-6951
Electronic ISSN 1077-3118
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 86
Issue 7
DOI https://doi.org/10.1063/1.1866643
Keywords VRH, NNH, R-T characteristics, Thick films, sputtered films, STS.

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Copyright Statement
© 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. The following article appeared in 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://dx.doi.org/10.1063/1.1866643




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