Physics – Condensed Matter – Superconductivity
Scientific paper
2006-06-09
Physics
Condensed Matter
Superconductivity
11 pages, 4 figures
Scientific paper
Isotope effects in a multiband superconductor with a leading interband pairing channel are investigated. A relatively small electron-phonon contribution into the pair-transfer interaction can cause effects of observed magnitude. A multiband model which interpolates the cuprate properties is used for illustrative calculations. Isotope exponents of the transition temperature ($\alpha$), supercarrier density ($\alpha_n$), paired carrier effective mass ($\alpha_m$) and of the penetration depth ($\alpha_{\lambda}$) on the doping scale have been obtained. The known opposite trend of $\alpha$ and $T_c$ is reflected. The trends of $\alpha$ and $\alpha_n$ are similar. In contrast with the usual assumption in the interband case $\alpha_{\lambda}$ is driven by $\alpha_n$, which overwhelmes $\alpha_m$.
Kristoffel Nikolai
Rubin Pavel
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