Fabrication of YBa2Cu3O7 twin-boundary-junction dc SQUID by using a focused-ion-beam pattern technique
- Authors
- Lee, Sung Hoon; Lee, Soon-Gul
- Issue Date
- 9월-2017
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- YBa2Cu3O7; Twin boundary; SQUID
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.71, no.5, pp.289 - 292
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 71
- Number
- 5
- Start Page
- 289
- End Page
- 292
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82364
- DOI
- 10.3938/jkps.71.289
- ISSN
- 0374-4884
- Abstract
- We have fabricated YBa2Cu3O7 (YBCO) dc SQUIDs containing nanobridges across twin boundaries of LaAlO3 (LAO) substrates as Josephson elements by using a focused ion beam (FIB) etching method and measured their transport properties. The beam energy was 30 keV and the current was 1.5 pA for the nanobridge pattern. Each bridge with a nominal width of 200 nm crossed a twin boundary in the (100) direction. The SQUID loop had a 10 mu m x 10 mu m hole with a 5.7 mu m average linewidth. The SQUID voltage showed modulations in response to the external flux with a maximum modulation depth of 350 mu V at 77.0 K. HR-XRD spectra showed that the epitaxially grown YBCO film was twinned in commensurate with the twinning of the LAO substrate. Tilting of the c-axis of YBCO across the twin boundary is believed to play a role as a tunnel barrier.
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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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