APPLICATION OF A NEAR COINCIDENCE SITE LATTICE THEORY TO THE ORIENTATIONS OF YBA2CU3O7-X GRAINS ON (001) MGO SUBSTRATES

被引：129

作者：

HWANG, DM ^{[1
]}

RAVI, TS ^{[1
]}

RAMESH, R ^{[1
]}

CHAN, SW ^{[1
]}

CHEN, CY ^{[1
]}

NAZAR, L ^{[1
]}

WU, XD ^{[1
]}

INAM, A ^{[1
]}

VENKATESAN, T ^{[1
]}

机构：

[1] RUTGERS STATE UNIV,DEPT PHYS,PISCATAWAY,NJ 08854

来源：

APPLIED PHYSICS LETTERS | 1990年 / 57卷 / 16期

关键词：

D O I：

10.1063/1.104138

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Various orientations of YBa2Cu3O7-x grains in polycrystalline films prepared on (001)MgO substrates by in situ laser deposition were determined using electron diffraction. Eight different types of in-plane orientations have been observed. These orientations agree well with the prediction of a simplified theory of near coincidence site lattice between YBa2Cu3O7-x and MgO. The YBa2Cu 3O7-x grains were found to have a high probability of forming low angle or low Σ boundaries among themselves. These grain boundaries are of low energy and should exhibit a high connectivity of Cu-O-Cu chains. Therefore, YBa2Cu3O7-x thin films on MgO can attain a Tc of ∼90 K and a Jc of ∼10 6 A/cm2 at 77 K.

引用

页码：1690 / 1692

页数：3

共 16 条

[1] OBSERVATIONS AND IMPLICATIONS OF GRAIN-BOUNDARY DISLOCATION NETWORKS IN HIGH-ANGLE YBA2CU3O7-DELTA GRAIN-BOUNDARIES [J].