The resistance versus temperature (R–T) characteristics of NiMn2O4+δ 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.
No takes yet. Share an insight, caveat, or question.
Schmidt et al. (2005) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: