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Isotope effects in multiband superconductors | N.Kristoffel
; P.Rubin
; | Date: |
9 Jun 2006 | Subject: | Superconductivity | Abstract: | 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 $alpha_m$. | Source: | arXiv, cond-mat/0606230 | Services: | Forum | Review | PDF | Favorites |
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