Schmidt, RainerBasu, A.Brinkman, A. W.Klusek, Z.Datta, P. K.2023-06-202023-06-202005-02-141) N. Tsuda, K. Nasu, A. Fujimori, K. Siratori, in Electronic Conduction in Oxides, Solid-State Sciences, edited by M. Cardona et al. (Springer, Berlin, 2002). 2) E. D. Macklen, Thermistors (Electrochemical Publications, Glasgow, 1979). 3) V. A. M. Brabers, J. C. J. M. Terhell, Phys. Status Solidi A, 69, 325 (1982). 4) J. A. Becker, C. B. Green, G. L. Pearson, Bell Syst. Tech. J., 26, 170 (1947). 5) A. Feltz, J. Töpfer, F. Schirrmeister, J. Eur. Ceram. Soc., 9, 187 (1992). 6) G. Kotliar, D. Vollhardt, Phys. Today, 57(3), 53 (2004). 7) R. Mansfield, in Hopping Transport in Solids, edited by M. Pollak and B. Shklovskii (Elsevier Science, Amsterdam, 1991). 8) B. I. Shklovskii, A. L. Efros, Electronic Properties of Doped Semiconductors, Solid State Sciences 45 (Springer, Berlin, 1984). 9) R. Schmidt, A. Stiegelschmitt, A. Roosen, A. W. Brinkman, J. Eur. Ceram. Soc., 23, 1549 (2003). 10) R. Schmidt, A. Basu, A. W. Brinkman, J. Eur. Ceram. Soc., 24, 1233 (2004). 11) A. Navrotsky, O. J. Kleppa, J. Inorg. Nucl. Chem., 29, 2701 (1967). 12) R. Schmidt, Ph.D. thesis, University of Durham, 2003. 13) A. Basu, Ph.D. thesis, University of Durham, 2002. 14) A. Basu, A. W. Brinkman, Z. Klusek, P. K. Datta, P. Kowalczyk, J. Appl. Phys., 92, 4123 (2002).0003-695110.1063/1.1866643https://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