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 La2-xSrxCuO4 as a function of doping with a sharp peak alpha similar to 0.8 in the underdoped regime and a rapid drop to alpha similar to 0.2 at 0.125 holes per copper site.
The isotope effect in a superlattice of quantum stripes / A., Perali; A., Valletta; G., Bardelloni; Bianconi, Antonio; A., Lanzara; Saini, Naurang Lal. - In: JOURNAL OF SUPERCONDUCTIVITY. - ISSN 0896-1107. - STAMPA. - 10:(1997), pp. 355-359. [10.1007/BF02765718]
The isotope effect in a superlattice of quantum stripes
BIANCONI, Antonio;SAINI, Naurang Lal
1997
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 La2-xSrxCuO4 as a function of doping with a sharp peak alpha similar to 0.8 in the underdoped regime and a rapid drop to alpha similar to 0.2 at 0.125 holes per copper site.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
