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Electron-hopping modes in NiMn_(2)O_(4+δ) materials

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Schmidt, Rainer and Basu, A. and Brinkman, A. W. and Klusek, Z. and Datta, P. K. (2005) Electron-hopping modes in NiMn_(2)O_(4+δ) materials. Applied physics letters, 86 (7). ISSN 0003-6951

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Official URL: http://dx.doi.org/10.1063/1.1866643


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Abstract

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.


Item Type:Article
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© 2005 American Institute of Physics. A.B. acknowledges financial support from the Overseas Research Scholarship (ORS) scheme and the University of Durham.

Uncontrolled Keywords:Conductivity; Thermistors.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:33140
Deposited On:17 Sep 2015 09:20
Last Modified:10 Dec 2018 14:58

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