The isotope effect in a superlattice of quantum stripes

被引：15
|
作者：
Perali, A [1 ]
Valletta, A [1 ]
Bardelloni, G [1 ]
Bianconi, A [1 ]
Lanzara, A [1 ]
Saini, NL [1 ]
机构：
[1] IST NAZL FIS NUCL,DIPARTIMENTO FIS,I-00185 ROME,ITALY
来源：
JOURNAL OF SUPERCONDUCTIVITY | 1997年 / 10卷 / 04期
关键词：
quantum stripes; isotope effect; superlattice;
D O I：
10.1007/BF02765718
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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.
引用
收藏
页码：355 / 359
页数：5
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