Isotope effects in multiband superconductors
Kristoffel, N. · Rubin, P.
Original · EN
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 (α), supercarrier density (αₙ), paired carrier effective mass (αₘ) and of the penetration depth (αλ) on the doping scale have been obtained. The known opposite trend of α and Tc is reflected. The trends of α and αₙ are similar. In contrast with the usual assumption in the interband case αλ is driven by αₙ, which overwhelmes αₘ.
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