Crystal structure and superconductivity of rubidium tungsten bronzes RbxWO3 prepared by a hybrid microwave method |
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| Authors: | Juan Guo Cheng Dong Hong Chen |
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| Affiliation: | a School of Physics and Engineering, Zhengzhou University, Zhengzhou, Henan 450052, China
b National Laboratory for Superconductivity, Institute of Physics & Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Science, P.O. Box 603, Beijing 100080, China |
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| Abstract: | The rubidium tungsten bronzes RbxWO3 have been prepared from Rb2CO3, WO3 and W powders using hybrid microwave method. The single hexagonal phase samples can be obtained as actual rubidium content x in the range of 0.21-0.33, and their lattice parameters a and c linearly drop and rise with the increase of rubidium content respectively. For samples with x = 0.14, 0.16, 0.18, the superconducting transition temperature Tc from resistivity measurements does not change with the rubidium content, while Tc from susceptibility measurements shows a decrease from 5.3 K for x = 0.14 to 4.8 K for x = 0.18. The charge density wave (CDW) transition appears in Rb0.21WO3, Rb0.23WO3 and Rb0.25WO3 at about 200-260 K. The CDW transition is most obvious in Rb0.23WO3 which shows the lowest degree of crystallization among the samples. |
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| Keywords: | A. Oxides A. Superconductors B. Chemical synthesis D. Crystal structure D. Electrical properties |
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