Quantum tunneling currents in a superconducting junction

A. H. Worsham; N. G. Ugras; D. Winkler; D. E. Prober; N. R. Erickson; P. F. Goldsmith

doi:10.1103/PhysRevLett.67.3034

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Quantum tunneling currents in a superconducting junction

A. H. Worsham, N. G. Ugras, D. Winkler, D. E. Prober, N. R. Erickson, P. F. Goldsmith

DOI 10.1103/PhysRevLett.67.3034 · Physical Review Letters

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Abstract

We have measured the full voltage dependence of the quantum conductance and quantum susceptance which arise, respectively, from the dissipative and nondissipative quasiparticle tunneling currents in a superconductor-insulator-superconductor tunnel junction. Using a standing-wave technique, we measured the admittance of the tunnel junction at 87 GHz. The admittance is the sum of the quantum conductance and the quantum susceptance. We report the first direct observation of the reactive quasiparticle singularity which is evident in the quantum susceptance.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb/AlOx/Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown