Strong Electron-Phonon Coupling in Superconducting MgB$_2$: A Specific Heat Study

Details Strong Electron-Phonon Coupling in Superconducting MgB$_2$: A Specific Heat Study Strong Electron-Phonon Coupling in Superconducting MgB$_2$: A Specific Heat Study

2001-02-28

arxiv.org/abs/cond-mat/0102522v3

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.64.172515

We report on measurements of the specific heat of the recently discovered superconductor MgB$_2$ in the temperature range between 3 and 220 K. Based on a modified Debye-Einstein model, we have achieved a rather accurate account of the lattice contribution to the specific heat, which allows us to separate the electronic contribution from the total measured specific heat. From our result for the electronic specific heat, we estimate the electron-phonon coupling constant $\lambda$ to be of the order of 2, significantly enhanced compared to common weak-coupling values $\leq 0.4$. Our data also indicate that the electronic specific heat in the superconducting state of MgB$_2$ can be accounted for by a conventional, s-wave type BCS-model.

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