Enhanced electrical correlation in the W-doped cobaltite Ca3Co4O9 ceramics
| Autor: | Bangchuan Zhao, Yankun Fu, Yanan Huang, Yuping Sun, Jianming Dai |
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| Rok vydání: | 2013 |
| Předmět: |
Valence (chemistry)
Materials science Condensed matter physics Doping technology industry and agriculture Atmospheric temperature range Condensed Matter Physics Electronic Optical and Magnetic Materials Cobaltite Condensed Matter::Materials Science chemistry.chemical_compound chemistry Ferrimagnetism Electrical resistivity and conductivity Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Fermi liquid theory Crystallite Electrical and Electronic Engineering human activities |
| Zdroj: | Physica B: Condensed Matter. 414:16-20 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2012.12.048 |
| Popis: | The effect of W-doping at Co-site on structural, magnetic, and transport properties in Ca3Co4−xWxO9 (0≤x≤0.4) polycrystalline samples has been studied. Based on the analysis of the structural parameter variations, the substitution is suggested to occur at Co-site in Ca2CoO3 layers. Magnetic results show that the low-temperature magnetic behavior of the series samples changes from a ferrimagnetic state of Ca3Co4O9 to a glass-like state for the W-doped samples. The result is suggested to originate from the variation of the average valence of Co ions induced by W-doping. All samples show metal-insulator transition at Tmin and Tmin increases monotonously with increasing W-doping level. The temperature range shows Fermi liquid transport behavior becomes narrower with increasing W-doping level, indicating an enhanced electron–electron correlation. Moreover, the resistivity increases and the transport mechanism changes from thermally activated model to the Mott’s variable range hoping model as W-doped into the system. The variation of the resistivity and the transport mechanism is ascribed to the increased distortion or disorder induced by W-doping. |
| Databáze: | OpenAIRE |
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