Theory of the negative isotope effect on copper in underdoped YBCO

被引：5

作者：

Abrikosov, AA ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICA C | 2000年 / 336卷 / 3-4期

关键词：

negative isotope; copper; YBCO;

D O I：

10.1016/S0921-4534(00)00280-X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An explanation is proposed of the negative isotope effect observed on copper in underdoped YBa2Cu3O7-delta. Calculations show that such an effect can be due to scattering of electrons from low-frequency phonons, which are not associated with oscillations of the total ionic charge density. The negative isotope effect is specific for superconducting layered curates with a d-wave order parameter and is absent in s-type superconductors of the same kind. Although the theory does not reproduce all observed features of the dependence of the isotope effect on oxygen concentration, it agrees qualitatively with the general trend of enhancement with decreasing T-c. A discussion is presented, and several possible experiments are proposed. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：163 / 169

页数：7

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