Detection of the superconducting transition and magnetic flux trapping in a niobium micro-ring by using micro-Hall sensors

被引：1

作者：

Kahng, Yung Ho ^{[1
,2
]}

Kim, Yun Won ^{[1
]}

Kim, Mun Seog ^{[1
]}

Song, Woon ^{[1
]}

Choi, Jae-Hyuk ^{[1
]}

Joo, Sungjung ^{[3
,4
]}

Hong, Jinki ^{[3
]}

Rhie, Kungwon ^{[3
]}

Lee, Soon-Gul ^{[3
]}

机构：

[1] Korea Res Inst Stand & Sci, Div Phys Metrol, Daejeon 34113, South Korea

[2] Chonnam Natl Univ, Dept Phys Educ, Gwangju 61186, South Korea

[3] Korea Univ, Dept Display & Semicond Phys, Sejong Campus, Sejong 30019, South Korea

[4] Korea Res Inst Stand & Sci, Daejeon 34113, South Korea

来源：

JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2016年 / 69卷 / 09期

关键词：

Superconductivity; Magnetic flux; Nb micro-ring; Micro-Hall sensor; QUANTIZED FLUX; NB; CYLINDERS; PERFORMANCE; DEPENDENCE; THICKNESS; DEVICES;

D O I：

10.3938/jkps.69.1456

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

An InAs heterostructure-based micro-Hall sensor was used to study the magnetic properties of a superconducting Nb micro-ring, enabling observation of magnetic phenomena such as diamagnetism onset and magnetic flux trapping in the 20-mu m-diameter sample. The superconducting diamagnetism of the micro-ring was observed to develop slowly from T = 7.5 K down to 5 K and showed a notably sharp and substantial drop at 7.0 K, the zero-resistivity temperature obtained from transport measurements on a strip-patterned sample. The observed superconducting transition is discussed in terms of a percolation scenario. In magnetic-field-cooling measurements, the Hall signal from the magnetic flux trapped in the Nb ring at 4.5 K was detected at a sufficiently high level for quantitative comparison with the estimate.

引用

页码：1456 / 1461

页数：6

共 26 条

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