MODULATIONS IN THE CUO CHAIN LAYER OF YBA2CU3O7-DELTA - CHARGE-DENSITY WAVES

被引:116
作者
EDWARDS, HL [1 ]
BARR, AL [1 ]
MARKERT, JT [1 ]
DELOZANNE, AL [1 ]
机构
[1] UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712
关键词
D O I
10.1103/PhysRevLett.73.1154
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We have performed reversed-bias scanning tunneling microscopy at 20 K on the CuO chain layer of cold-cleaved single crystals of YBa2Cu3O7-delta. We find 1.3-nm corrugations which change sign under bias polarity reversal. This behavior and the 1.3-nm wavelength are in agreement with the hypothesis that the one-dimensional CuO chains undergo a charge density wave transition. This is the first real-space evidence of such a transition in YBa2Cu3O7-delta. We also explore the possibility that the corrugations are caused by Friedel oscillations or bipolaron scattering. Several-nm depressions along the CuO chains transform into broad swells and depressions as the bias voltage is increased.
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收藏
页码:1154 / 1157
页数:4
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