Open AccessTHEORY OF SUPERCONDUCTIVITY IN ALKALI-METAL-DOPED FULLERENES
Author(s) -
Dadong Yan,
Zhijian Wang,
Xu Tiefeng,
Wenzhu Li
Publication year - 1994
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.43.1159
Subject(s) - superconductivity , fullerene , condensed matter physics , alkali metal , phonon , intermolecular force , materials science , doping , intramolecular force , spectral line , coupling (piping) , range (aeronautics) , physics , quantum mechanics , molecule , metallurgy , composite material
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 △0Bc.