Publication: Electron-hopping modes in NiMn_(2)O_(4+δ) materials
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2005-02-14
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American Institute of Physics
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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.
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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.
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