SCANNING TUNNELING MICROSCOPY OF PULSED-LASER-DEPOSITED YBA2CU3O7-DELTA EPITAXIAL THIN-FILMS - SURFACE MICROSTRUCTURE AND GROWTH-MECHANISM

被引：66
作者：
NORTON, DP
LOWNDES, DH
ZHENG, XY
ZHU, S
WARMACK, RJ
机构：
[1] OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831
[2] UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996
来源：
PHYSICAL REVIEW B | 1991年 / 44卷 / 17期
关键词：
D O I：
10.1103/PhysRevB.44.9760
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Scanning tunneling microscopy suggests that epitaxial YBa2Cu3O7-delta thin films grow unit cell by unit cell, by a terraced-island-growth mode. Although films grown at low temperatures exhibit a spiral-growth surface microstructure, films with high critical current densities (grown at high temperatures on nearly-lattice-matched substrates) do not. The terraced microstructure explains the steps found in ultrathin YBa2Cu3O7-delta layers in YBa2Cu3O7-delta/PrBa2Cu3O7-delta superlattices. These steps may act as superconducting weak links, providing support for Josephson-coupled-array models of superconducting superlattices.
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收藏
页码：9760 / 9763
页数：4
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