期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 78, 期 6, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.064702
关键词
pyrochlore oxide; CsOs2O6; RbOs2O6; KOs2O6; superconductivity; rattling; specific heat
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [16340101, 20102004]
- Grants-in-Aid for Scientific Research [16340101] Funding Source: KAKEN
The superconducting properties of two beta-pyrochlore oxides, CsOs2O6 and RbOs2O6, are studied by thermodynamic and transport measurements using high-quality single crystals. It is shown that the character of superconductivity changes systematically from weak coupling for CsOs2O6 to moderately strong coupling for RbOs2O6, and finally to extremely strong coupling with BCS-type superconductivity for KOs2O6, with increasing T-c. Strong-coupling correction analyses of the superconducting properties reveal that a low-energy rattling mode of the alkali metal ions is responsible for the mechanism of the superconductivity in each compound. The large enhancement of T-c from Cs to K is attributed to the increase in the electron-rattler coupling with decreasing characteristic energy of the rattling and with increasing anharmonicity. The existence of weak anisotropy in the superconducting gap or in the electron-rattler interactions is found for the Cs and Rb compounds.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据