GROWTH-MECHANISM OF SPUTTERED FILMS OF YBA2CU3O7 STUDIED BY SCANNING TUNNELING MICROSCOPY

被引：380
作者：
HAWLEY, M [1 ]
RAISTRICK, ID [1 ]
BEERY, JG [1 ]
HOULTON, RJ [1 ]
机构：
[1] UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545
来源：
SCIENCE | 1991年 / 251卷 / 5001期
关键词：
D O I：
10.1126/science.251.5001.1587
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The surface microstructures of c-axis-oriented films of YBa2Cu3O7, deposited by off-axis magnetron sputtering on MgO and SrTiO3 single crystal (100) substrates, have been investigated with scanning tunneling microscopy and atomic force microscopy. There is strong evidence that the films nucleate as islands and grow by adding material to the edge of a spirally rising step. This results in columnar grains, each of which contains a screw dislocation at its center. This microstructure may be of significance in determining superconducting properties such as critical current, and represents a significant difference between thin films (especially those grown in situ) and bulk materials.
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页码：1587 / 1589
页数：3
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