Electron-hopping modes in NiMn_(2)O_(4+δ) materials
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...
| Authors: | , , , , |
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| Format: | article |
| Publication Date: | 2005 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/51564 |
| Online Access: | https://hdl.handle.net/20.500.14352/51564 |
| Access Level: | Open access |
| Keyword: | 537 Conductivity Thermistors. Electricidad Electrónica (Física) 2202.03 Electricidad |
| Summary: | 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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