A ROOT-2X-ROOT-2 SURFACE RECONSTRUCTION OF (001) CLEAVED GDBA2CU3O7-DELTA

被引：13
|
作者：
ZANDBERGEN, HW
机构：
[1] National Center for HREM, Laboratory of Materials Science, Delft University of Technology, 2628 AL Delft
来源：
PHYSICA C | 1992年 / 194卷 / 3-4期
关键词：
D O I：
10.1016/S0921-4534(05)80006-1
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The atomic structure at the (001) surface of GdBa2Cu3O7-delta obtained by cleavage of melt-textured material is determined with high resolution electron microscopy. It was observed that in a majority of the clean (001) surfaces, the surface layer is a CUO2 layer neighboring the Gd-vacancy layer of the bulk (bulk-Gd-CuO2-vacuum). The preference for this termination at the CUO2 layer does not depend on delta. For this termination a square-root 2 x square-root 2 surface reconstruction occurs. For the second most occurring interruption: bulk-CuO1-delta-BaO-vacuum the surface relaxation is rather small. The surface reconstruction and surface relaxations can explain the absence of a superconducting energy gap in the photoemission spectra.
引用
收藏
页码：287 / 292
页数：6
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