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A new method of probing the phonon mechanism in superconductors, including MgB2

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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.  [iopmath latex="$\lambda_{tr}$"] tr [/iopmath] ) decreases with increasing disorder, as manifested by Mooij's empirical rule. In addition, Testardi's universal correlation of [iopmath latex="$T_c$"] Tc [/iopmath] (i.e.  [iopmath latex="$\lambda$"] [/iopmath] ) and the resistance ratio (i.e.  [iopmath latex="$\lambda_{tr}$"] tr [/iopmath] ) follows. This understanding provides a new means to probe the phonon mechanism in superconductors, including MgB2. The merits of this method are its applicability to any superconductor and its reliability because the McMillan's electron-phonon coupling constant [iopmath latex="$\lambda$"] [/iopmath] and [iopmath latex="$\lambda_{tr}$"] tr [/iopmath] change in a broad range, from finite values to zero, due to weak localization. Karkin et al's preliminary data of irradiated MgB2 show the Testardi correlation, indicating that the dominant pairing mechanism in MgB2 is a phonon-mediated interaction.

Document Type: Miscellaneous

Affiliations: 1: Department of Physics, University of Puerto Rico at Humacao, Humacao, PR 00791, Puerto Rico 2: Department of Physics, Bilkent University, 06533 Bilkent, Ankara, Turkey

Publication date: July 1, 2001


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