Thermal fluctuations in ultrasmall intrinsic Josephson junctions
A. Franz, Y. Koval, D. Vasyukov, P. Müller, H. Schneidewind, D. A. Ryndyk, J. Keller, C. Helm
DOI 10.1103/PhysRevB.69.014506 · Physical Review B
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Abstract
Current-voltage curves of small area hysteretic intrinsic Josephson junctions, for which the Josephson energy EJ=ħJc/2e is of the order of thermal energy kT, are investigated. A nonmonotonic temperature dependence of the switching current is observed and explained by thermal phase fluctuations. At low temperatures premature switching from the superconducting into the resistive state is the most important effect of fluctuations. At high temperatures only a single resistive branch is observed. At the cross over temperature a hysteretic phase-diffusion branch exists. It shows the importance of a frequency-dependent impedance of an external circuit formed by the leads.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TBCCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 103 | Pressure not reported | unknown |
| TBCCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98.6 | Pressure not reported | unknown |
| TBCCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure not reported | unknown |
| BSCCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86.5 | Pressure not reported | unknown |
| BSCCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87.5 | Pressure not reported | unknown |
| BSCCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 79.5 | Pressure not reported | unknown |
| BSCCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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