Scanning SQUID microscopy of sparsely twinned YBa2Cu3O7-delta

被引：41

作者：

Moler, KA

Kirtley, JR

Liang, RX

Bonn, D

Hardy, WN

机构：

[1] IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598

[2] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER,BC V6T 1Z1,CANADA

来源：

PHYSICAL REVIEW B | 1997年 / 55卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.55.12753

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic images of two sparsely twinned YBa2Cu3O7-delta single crystals were taken in low applied magnetic fields (H-a < 100 mG) with a scanning SQUID microscope. The SQUID sensors have 4 or 8 mu m pickup loops and a magnetic flux resolution of 10(-3)hc/2e under normal operating conditions. The images showed Meissner screening with a large demagnetization factor and isolated trapped vortices. The trapped vortices carried integral (hc/2e) magnetic flux and were much smaller than the spatial resolution of the sensor. At this level of resolution, there was no evidence for unusual magnetic features, such as fractional vortices, associated with the twin boundaries.

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页码：12753 / 12758

页数：6

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