# Electron-phonon interaction in carbon clathrate hex- $\mathsf{C_{40}}$

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## Abstract

The electron-phonon interaction in Li-doped carbon clathrates hex-LiC 40 and hex-Li 2C 40 has been investigated from first principles. Although the characteristic phonon frequency and electron-phonon interaction are large, the electronic density of states is relatively low which finally gives an electron-phonon coupling constant $\lambda=0.46$ for Li 2C 40 . Hole-doping is expected to provide higher T c than n-doping in hex-C 40 . Copyright Springer-Verlag Berlin/Heidelberg 2003

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