Schmidt, RainerBasu, A.Brinkman, A. W.Klusek, Z.Datta, P. K.2023-06-202023-06-202005-02-140003-695110.1063/1.1866643https://hdl.handle.net/20.500.14352/51564© 2005 American Institute of Physics. A.B. acknowledges financial support from the Overseas Research Scholarship (ORS) scheme and the University of Durham.The resistance versus temperature (R–T) characteristics of NiMn_(2)O_(4+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.engjournal articlehttp://dx.doi.org/10.1063/1.1866643http://scitation.aip.org/open access537ConductivityThermistors.ElectricidadElectrónica (Física)2202.03 Electricidad