Ru-doping effect on the thermopower and electrical transport properties of misfit-layered Ca3Co4O9+δ
| Autor: | Xibin Xu, Qisheng Wu, Dewei Zhang, Li Qiu, Youwei Du, Zhihe Wang, X.B. Xu |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Doping 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Condensed Matter::Materials Science Electrical transport Electrical resistivity and conductivity Condensed Matter::Superconductivity Seebeck coefficient 0103 physical sciences Materials Chemistry Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| Zdroj: | Solid State Communications. 225:27-31 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/j.ssc.2015.10.018 |
| Popis: | We have studied Ru-doping effect on the thermopower and electrical transport properties of Ca3Co4O9+δ samples. A thermopower in Ca3Co4−xRuxO9+δ was enhanced by Ru doping. A clear field-induced suppression of thermopower implies a large spin entropy contribution. Magnetic results indicate that the spin entropy enhancement originates from the decrease of Co4+ concentration induced by Ru-doping. The increase of resistivity results from the decreases of carrier concentration and mobility. The electrical transport properties reveal that Ru-doping induces a metal–insulator transition at x≈0.2 and the thermally activated mechanism dominates the transport behavior at low temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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