Admittance of a long diffusive SNS junction

Abstract

The dynamical properties of hybrid normal metal/superconductor structures have recently come into research focus both experimentally and theoretically. Recent experimental studies of the coherent admittance of SNS rings as function of the phase difference ${\varphi }_0$ are still not fully understood. Here we concentrate on the linear response regime, calculating $Y(\omega )$ by solving Usadel equations, linearised in electric field. Although partially reproducing previously known results, we find qualitatively different behaviour in the collisionless regime of ${\tau }_{in}^{-1}\ll \omega \lesssim E_{Th}$ and high temperature $T\gg E_{Th}$ and low temperature $T\lesssim E_{Th}$ near the minigap closing ${\varphi }_0\sim \pi$. We find that the dissipative part $\mbox{Re}Y(ω)$ peaks when the minigap closes (at a phase difference of $\pi$) even at high temperatures, when the equilibrium supercurrent is fully suppressed.

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• The discovery, disappearance and re-emergence of radiation-stimulated superconductivity
• Quantum decay of the supercurrent and intrinsic capacitance of Josephson junctions beyond the tunnel limit
• Microwave response of a superconductor beyond the Eliashberg theory
• Microwave Admittance of Gold-Palladium Nanowires with Proximity-Induced Superconductivity
• Static and dynamic properties of Josephson weak links with singlet and triplet coupling
• Intrinsic dissipation in superconducting junctions probed by qubit spectroscopy
• ac properties of short Josephson weak links