Detection of the superconducting transition and magnetic flux trapping in a niobium micro-ring by using micro-Hall sensors
- Authors
- Kahng, Yung Ho; Kim, Yun Won; Kim, Mun Seog; Song, Woon; Choi, Jae-Hyuk; Joo, Sungjung; Hong, Jinki; Rhie, Kungwon; Lee, Soon-Gul
- Issue Date
- 11월-2016
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Superconductivity; Magnetic flux; Nb micro-ring; Micro-Hall sensor
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.69, no.9, pp.1456 - 1461
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 69
- Number
- 9
- Start Page
- 1456
- End Page
- 1461
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/86933
- DOI
- 10.3938/jkps.69.1456
- ISSN
- 0374-4884
- Abstract
- 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.
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Collections - College of Science and Technology > Semiconductor Physics in Division of Display and Semiconductor Physics > 1. Journal Articles
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