CORRELATION BETWEEN OXYGEN ISOTOPE SHIFT AND TC IN 2-LAYER AND 3-LAYER HIGH-TEMPERATURE SUPERCONDUCTORS

被引：13

作者：

BORNEMANN, HJ ^{[1
]}

MORRIS, DE ^{[1
]}

LIU, HB ^{[1
]}

SINHA, APB ^{[1
]}

NARWANKAR, P ^{[1
]}

CHANDRACHOOD, M ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720

来源：

PHYSICA C | 1991年 / 185卷

关键词：

D O I：

10.1016/0921-4534(91)91903-H

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Oxygen isotope shift experiments were performed on several series of high temperature superconductors doped with various ions (isovalent and non-isovalent) at different sites. Substantial oxygen isotope shifts are found even above 70 K, but alpha-0 does not rise with decreasing T(c) in all cases. Changes in T(c) and alpha-0 can be correlated with the total hole concentration in several systems. Comparing different cuprate superconductors there appears to be an overall monotonic trend to lower values of alpha-0 with increasing T(c) and number of copper layers. This trend continues even above 100 K where alpha-0 becomes negative in Bi-2223. Our results strongly suggest that all oxide high-temperature superconductors are phonon-coupled with near cancellation of alpha-0 by opposing effects when T(c) is high.

引用

页码：1359 / 1360

页数：2