Constraints from Tc and the isotope effect for MgB2
Abstract
With the constraint that Tc = 39 K, as observed for MgB2, we use the Eliashberg equations to compute possible allowed values of the isotope coefficient, β. We find that while the observed value β= 0.32 can be obtained in principle, it is difficult to reconcile a recently calculated spectral function with such a low observed value.
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