Charge Density Wave and Crystal Structure of $$\hbox {K}_{x}\hbox {WO}_{3}$$ K x WO 3 ( $$x=0.20$$ x = 0.20 and 0.22) Prepared by Hybrid Microwave Method
| Autor: | Runze Chen, Chaojun Gao, Erjun Liang, Zichen Wang, Lianjun Wen, Juan Guo, Mingju Chao, Cheng Dong, Kun Bu, Xiaoyu Hao, Lihong Yang |
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| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Transition temperature 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Magnetization Residual resistivity Crystallography Octahedron Electrical resistivity and conductivity 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology Charge density wave |
| Zdroj: | Journal of Low Temperature Physics. 188:1-10 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/s10909-017-1762-6 |
| Popis: | Potassium tungsten bronzes $$\hbox {K}_{x}\hbox {WO}_{3}$$ ( $$x=0.20$$ and 0.22) with the coexistence of charge density wave (CDW) and superconductivity (SC) were prepared from $$\hbox {K}_{2}\hbox {WO}_{4},\, \hbox {WO}_{3}$$ and W powders using a hybrid microwave method. The structure refinement confirmed that all samples had a pure hexagonal phase with the space group of $$P6_{3}$$ /mcm. The distortion degree of W–O octahedron declines with x and is independent of synthesis condition for the same x (=0.20). The CDW transition is studied as a function of residual resistivity ratio. By increasing the crystallinity of sample, this transition can be suppressed, which is probably attributed to the interaction between CDW and defects in crystallites. The CDW transition temperature increases with x, which may be related to the decline of the distortion degree of W–O octahedron. The competition between CDW and SC is observed according to the resistivity and magnetization measurements. |
| Databáze: | OpenAIRE |
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