Missing Shapiro steps in nonhysteretic Josephson junction with 2π periodic supercurrent
S. S. Ustavschikov, D. Yu. Vodolazov
DOI 10.1103/PhysRevB.110.184511 · Physical Review B
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Abstract
We theoretically demonstrate that in a nonhysteretic Josephson junction (JJ) with a 2π periodic supercurrent in the presence of radio-frequency (RF) radiation one or several low-lying Shapiro steps could be absent in the voltage-current (VI) characteristic. The effect exists at low RF power and at frequencies f approximately ten times smaller than f0=IcRN/Φ0 (where Ic is the critical current, RN is the normal-state resistance of the Josephson junction, and Φ0 is the magnetic flux quantum). The origin of the effect is related to the large differential resistance Rdiff=dV/dI near I≃Ic, which is significantly greater than the value predicted by the resistively capacitance shunted junction (RCSJ) model in the overdamped limit. Our theoretical results are supported by experiments on Nb/NbSi/Nb Josephson junctions with nonhysteretic VI curves, where we observe the absence of one or more low-lying Shapiro steps, depending on the frequency and power of the RF radiation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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