Direct observation of vortex images on lead micro-hole lattice by SQUID microscope

被引：7

作者：

Ishida, T ^{[1
]}

Yoshida, M

Okuda, K

Okayasu, S

Sasase, M

Hojou, K

Odawara, A

Nagata, A

Morooka, T

Nakayama, S

Chinone, K

机构：

[1] Univ Osaka Prefecture, Dept Phys & Elect, Sakai, Osaka 5998531, Japan

[2] Japan Atom Energy Res Inst, Naka, Ibaraki 3191195, Japan

[3] Seiko Instruments Inc, Sci Instruments Div, Chiba 2702222, Japan

来源：

PHYSICA C | 2001年 / 357卷 / SUPPL. 2期

关键词：

superconducting network; vortex; magnetization; matching field; Little-Parks effect; triangular micro-hole lattice; Pb film;

D O I：

10.1016/S0921-4534(01)00332-X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the magnetic properties of a triangular micro-hole lattice on Pb film (TriMHoLP) by means of a SQUID magnetometer and a SQUID microscope. A matching field Ho of TriMHoLP is 0.425 G. The zero-field-cooled magnetization curves are in accordance with those expected for typical superconductors. However, the curves taken in a field-cooling mode upon cooling are always negative irrelevant to the field polarity. Even in the zero field, we have observed an appreciable amount of vortices and anti-vortices by the SQUID microscope. These strongly suggest that there must be a spontaneous magnetization at temperatures near T-c. A clear vortex density wave has been found for a half-filling state of TriMHoLP. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：604 / 607

页数：4

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