Abstract
Some of the low and high T c superconductors exhibit an anomalous isotope effect, where the exponent ( α) for the isotope effect is much smaller than 1/2. We present computational results of the electronic structure of selected superconductors. The characteristically narrow electron bands of the materials suggest that the rapid variation of their density of states around the Fermi level, within the range of phonon energy, can have a noticeable effect on the total coupling matrix elements. Such effect may explain the anomalous isotope effect on T c in these materials.
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