Transition properties of a YBa2Cu3O7 nanobridge patterned across a twin boundary of a LaAlO3 substrate
- Authors
- Lee, Sung Hoon; Choi, Jae-Huyk; Lee, Soon-Gul
- Issue Date
- 15-3월-2012
- Publisher
- AMER INST PHYSICS
- Keywords
- YBa2Cu3O7 nanobridge; twin boundary; critical transport
- Citation
- JOURNAL OF APPLIED PHYSICS, v.111, no.6
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF APPLIED PHYSICS
- Volume
- 111
- Number
- 6
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/105293
- DOI
- 10.1063/1.3696977
- ISSN
- 0021-8979
- Abstract
- We have fabricated superconducting YBa2Cu3O7 (YBCO) nanobridges across twin boundaries of LaAlO3 (LAO) substrates by using focused-ion-beam etching and studied their critical transport properties. The nanobridges, nominally 150 nm in width, 100 - 120 nm in length, and 100 nm in thickness, showed T-c = 91K with Delta T-c congruent to 1 K and a high critical current density of J(c) congruent to 1.5 x 10(7) A/cm(2) at 77 K. Measured current-voltage curves of YBCO nanobridges across the substrate twin boundary showed resistively-shunted-junction characteristics near the transition with an excess current associated with flux flow. High-resolution X-ray diffraction spectra strongly indicated the possibility that the epitaxially-grown YBCO film was also twinned commensurate with twinning of the LAO substrate. Misorientation of the c-axis of YBCO at the twin boundary is believed to create weaknesses that dictate the behavior of the bridge across the twin boundary. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3696977]
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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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