Increase in the superconducting transition temperature by anisotropic strain effect in (001)La1.85Sr0.15CuO4 thin films on LaSrAlO4 substrates

被引：178

作者：

Sato, H

Naito, M

机构：

[1] NTT Basic Research Laboratories, Wakamiya, Kanagawa, 243-01, 3-1, Morinosato

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1997年 / 274卷 / 3-4期

关键词：

La2-xSrxCuO4; thin films; strain effect; superconducting transition temperature;

D O I：

10.1016/S0921-4534(96)00675-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report that (001) La1.85Sr0.15CuO4 thin films on LaSrAlO4 substrates exhibit T-c (R = 0) as high as 44 K, which is significantly higher than those of bulk samples of the same material under ambient pressure. The increase in T-c seems to be due to the plane stress produced by the lattice mismatch between the films and the substrates, which compresses the a-axis of the films, but expands the c-axis. By comparing our results with the previous pressure-effect studies, we suggest that not only the compression of the a-axis but also the expansion of the c-axis may be important in increasing T-c.

引用

收藏

页码：221 / 226

页数：6

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