Abstract
We have calculated the isotope effect coefficient and the critical temperature in a particular superconducting heterostructure formed by a bidimensional (2D) superlattice of metallic quantum stripes. We model the superlattice with a 2D free electron gas confined in a ID periodic potential barrier. Within the BCS theory we calculate the shape resonance for the critical temperature and the isotope coefficient as a function of the chemical potential. The results provide a good description of the anomalous behavior of the isotope coefficient in La{2-x}SrxCuO4 as a function of doping with a sharp peak α ~0.8 in the underdoped regime and a rapid drop to α ~0.2 at 0.125 holes per copper site.
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Perali, A., Valletta, A., Bardeiloni, G. et al. The isotope effect in a superlattice of quantum stripes. J Supercond 10, 355–359 (1997). https://doi.org/10.1007/BF02765718
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DOI: https://doi.org/10.1007/BF02765718