Zero-crossing Shapiro steps in high-T-c superconducting microstructures tailored by a focused ion beam
SCIE
SCOPUS
- Title
- Zero-crossing Shapiro steps in high-T-c superconducting microstructures tailored by a focused ion beam
- Authors
- Bae, MH; Dinsmore, RC; Sahu, M; Lee, HJ; Bezryadin, A
- Date Issued
- 2008-04
- Publisher
- AMER PHYSICAL SOC
- Abstract
- Microwave response of S-shaped Bi2Sr2CaCu2O8+x (BI-2212) micron-scale samples, in which the supercurrent was forced to flow perpendicular to the crystal layers, was investigated. A treatment with a focused ion beam allowed us to reduce the plasma frequency down to f(p)similar to 5 GHz at T=0.3 K in naturally stacked Josephson junctions in a crystal. We observed Shapiro steps at frequencies as low as similar to 5 GHz. Well-developed zero-crossing Shapiro steps were observed at frequencies as low as similar to 10 GHz. They appeared as constant-voltage plateaus with a nonzero voltage occurring at zero bias current. We confirmed that zero-crossing Shapiro steps in the Bi-2212 stacked junctions can be observed when the irradiated frequency is sufficiently larger than f(p). The observed high-order fractional steps in the microwave responses indicate that the interlayer-coupled Bi-2212 Josephson junctions have nonsinusoidal current-phase relation. Based on the temperature dependence of the steps, we also showed that the finite slope of the steps is due to the enhancement of the phase-diffusion effect.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12190
- DOI
- 10.1103/PhysRevB.77.144501
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 77, no. 14, page. 144501 - 144501, 2008-04
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