Abstract
Supercarrier effective mass isotope effect (exponent β) is investigated using a two-band model with interband pair scattering. The corresponding repulsive interaction incorporates besides the dominating electronic (Coulomb) part an electron-phonon contribution inversely proportional to the ionic mass factor. Calculations illustrating the behaviour of T c , its isotope exponent α, and β with doping in La 2−x Sr x CuO 4 type underdoped system reflect the observed tendencies. 2 Both α and β diminish with doping, the sign of β is opposite to α. A typical estimation gives |β| ∼ 0.2α.
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Kristoffel, N., Örd, T. Supercarrier Effective Mass Isotope Effect by Interband Scattering. Journal of Low Temperature Physics 117, 253–257 (1999). https://doi.org/10.1023/A:1022532608662
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DOI: https://doi.org/10.1023/A:1022532608662