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

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

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.
• Public URL: https://durham-repository.worktribe.com/output/1618910