Direct detection of the magnetic flux noise from moving vortices in wide YBa2Cu3O7-δ grain boundary junctions

被引：10

作者：

Hirano, S ^{[1
]}

Oyama, H

Kuriki, S

Morooka, T

Nakayama, S

机构：

[1] Hokkaido Univ, Res Inst Elect Sci, Sapporo, Hokkaido 0600812, Japan

[2] Seiko Instruments Inc, Chiba 2702222, Japan

来源：

APPLIED PHYSICS LETTERS | 2001年 / 78卷 / 12期

关键词：

D O I：

10.1063/1.1355669

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We measured the flux of a wide bicrystal grain boundary of YBa2Cu3O7-delta film, cooled to 77 K in a field of 10 muT, using a superconducting thin-film coil and Nb-based superconducting quantum interference device (SQUID). When the applied field was changed to, and above, a small threshold value, the sample showed random switching noises with a sharp increase in low-frequency noise power. The results suggested that there was long-distance movement of vortices over 20-500 mum within the grain boundary, driven by the shielding current. The vortex movement was suppressed to lengths of less than 1 mum in a slotted grain boundary by making an array of SQUIDs that can hold vortices stably. (C) 2001 American Institute of Physics.

引用

页码：1715 / 1717

页数：3

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