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

页码：355 / 359

页数：5

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