FORMATION OF CA-DOPED YBA2CU4O8 PHASE IN THIN-FILMS

被引：10

作者：

KITA, R

KAWAMOTO, S

OHATA, K

IZUMI, H

ITTI, R

MORISHITA, T

TANAKA, S

机构：

[1] Superconductivity Research Laboratory, International Superconductivity Technology Center, Koto-ku, Tokyo, 135

来源：

PHYSICA C | 1990年 / 170卷 / 5-6期

关键词：

D O I：

10.1016/0921-4534(90)90022-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Ca-doped YBa2Cu4O8 (124) thin films are prepared on (100) SrTiO3 substrates by annealing the amorphous films deposited using a pulsed laser deposition technique. The X-ray diffraction measurements show that the Ca-doped YBa2Cu4O8 phase is formed by annealing below 800°C at a oxygen pressure of 1 atm. The 124 films have c-axis orientation normal to the substrates. As the Ca content increases, the proportion of the 123 impurity phase in the samples increases. The onset temperature of superconductivity of the Y(Ca)Ba2Cu4O8 films increases from 79 K to 88 K with an increase Ca-substitution for 5 to 10% of Y. © 1990.

引用

页码：500 / 504

页数：5

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