A New Method of Probing the Phonon Mechanism in Superconductors including MgB$_{2}$

Details A New Method of Probing the Phonon Mechanism in Superconductors including MgB$_{2}$ A New Method of Probing the Phonon Mechanism in Superconductors including MgB$_{2}$

2001-05-04

arxiv.org/abs/cond-mat/0105091v1

Physics

Condensed Matter

Superconductivity

9 pages, latex, 3 figures

Scientific paper

10.1088/0953-2048/14/7/103

Weak localization has a strong influence on both the normal and superconducting properties of metals. In particular, since weak localization leads to the decoupling of electrons and phonons, the temperature dependence of resistance (i.e., $\lambda_{tr}$) is decreasing with increasing disorder, as manifested by Mooij's empirical rule. In addition, Testardi's universal correlation of $T_{c}$ (i.e., $\lambda$) and the resistance ratio (i.e., $\lambda_{tr}$) follows. This understanding provides a new means to probe the phonon mechanism in superconductors including MgB$_{2}$. The merits of this method are its applicability to any superconductors and its reliability because the McMillan's electron-phonon coupling constant $\lambda$ and $\lambda_{tr}$ change in a broad range, from finite values to zero, due to weak localization. Karkin et al's preliminary data of irradiated MgB$_{2}$ show the Testardi correlation, indicating that the dominant pairing mechanism in MgB$_{2}$ is the phonon-mediated interaction.

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