YTTRIUM-OXIDE INCLUSIONS IN YBA2CU3OX THIN-FILMS - ENHANCED FLUX PINNING AND RELATION TO COPPER-OXIDE SURFACE PARTICLES

被引：63

作者：

SELINDER, TI ^{[1
]}

HELMERSSON, U ^{[1
]}

HAN, Z ^{[1
]}

SUNDGREN, JE ^{[1
]}

SJOSTROM, H ^{[1
]}

WALLENBERG, LR ^{[1
]}

机构：

[1] UNIV LUND,NATL CTR HIGH RESOLUT MICROSCOPY,CTR CHEM,S-22100 LUND,SWEDEN

来源：

PHYSICA C | 1992年 / 202卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90297-P

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Semi-coherent Y2O3 (yttria) inclusions are identified in high quality epitaxial YBa2CuOx (YBCO) thin films by using transmission electron microscopy and energy dispersive X-ray analyses. Magnetization measurements show enhanced flux pinning in films containing an increasing number density of inclusions. The inclusions are incorporated into the films without disturbing the YBCO structure appreciably. The number density is almost-equal-to 10(17) cm-3 in films having transport critical currents of 4 x 10(6) A cm-2 at 77 K. Nucleation of the yttria inclusions is suggested to occur spontaneously during film growth. The abundance of yttria inclusions is connected to the occurrence of large Cu-rich surface particles in films that have optimum superconducting properties.

引用

页码：69 / 74

页数：6

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