Observation of weak coupling effects in Ba0.6K0.4Fe2As2 junctions patterned across a naturally formed grain boundary
- Authors
- Hong, Sung-Hak; Lee, Nam Hoon; Kang, Won Nam; Lee, Soon-Gul
- Issue Date
- 5월-2014
- Publisher
- IOP PUBLISHING LTD
- Keywords
- Ba0.6K0.4Fe2As2; grain boundary; superconductor junction
- Citation
- SUPERCONDUCTOR SCIENCE & TECHNOLOGY, v.27, no.5
- Indexed
- SCIE
SCOPUS
- Journal Title
- SUPERCONDUCTOR SCIENCE & TECHNOLOGY
- Volume
- 27
- Number
- 5
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/98615
- DOI
- 10.1088/0953-2048/27/5/055007
- ISSN
- 0953-2048
- Abstract
- We have fabricated intergrain nanobridge junctions from a Ba0.6K0.4Fe2As2 film and observed their weak coupling effects. We prepared the junction by patterning a nanobridge across a natural grain boundary by using a focused ion beam etching technique and studied their superconducting transition properties. The resistive transition showed three steps: the transitions of the bulk, the microbridge, and the junction grain boundary. Current-voltage curves showed typical Josephson junction characteristics, well-matched with the model of a resistively shunted junction incorporated with thermal fluctuations. Fitting data to theory revealed much larger current fluctuations than expected from the Johnson-Nyquist theorem. The junction showed a linear temperature dependence of the critical current and a constant normal-state resistance, indicating that the grain boundary played a role as a tunnel barrier with a very poor conductance.
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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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