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碱金属掺杂富勒烯超导体的临界温度和约化能隙研究

严大东 王志坚 徐铁峰 李文铸

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碱金属掺杂富勒烯超导体的临界温度和约化能隙研究

严大东, 王志坚, 徐铁峰, 李文铸

THEORY OF SUPERCONDUCTIVITY IN ALKALI-METAL-DOPED FULLERENES

YAN DA-DONG, WANG ZHI-JIAN, XU TIE-FENG, LI WEN-ZHU
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  • 碱金属掺杂富勒烯与传统的超导体情况不同,它有一个很宽区域的声子谱,其最高频率和最低频率分别与费密能EF和零温超导能隙△0为同一数量级,这必将导致对原来强耦合超导电性理论的修正。本文在此情况下求解Eliashberg方程,得到Tc和△0的表达式。结果表明,分子间的低频振动模和分子上的高频振动模同样参与电声耦合,Tc主要取决于声子谱中高频成份的贡献,而△0的增加主要取决于声子谱中
    It is different from the case of conventional superconductors that the alkali-metal-doped fullerenes have wide-frequency-range phonon spectra whose high-and low-frequency phonon modes are, respectively, comparable to the Fermi energy EF and the zero-temperature gap △0. This property will lead to a modification to the theory of conventional strong coupling superconductivity. In this paper, by solving the Eliash-berg equations, the expressions of Tc and △0 are obtained. The results show that both the intermolecular low-frequency modes and the intramolecular highfrequency modes participate the electron-phonon interactions; Tc mainly arise from the high-frequency modes while △0's enhancement mainly arise from the low-frequency modes. So, the experimental results can be explained, especially, the large ratio of 2△0/kBTc.
    • 基金项目: 国家自然科学基金和浙江省自然科学基金资助的课题.
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  • 文章访问数:  6503
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  • 被引次数: 0
出版历程
  • 收稿日期:  1993-07-20
  • 刊出日期:  1994-07-20

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