Apparent critical currents and rf steps in a second-order proximity-induced Josephson effect

Siyuan Han; L. F. Cohen; E. L. Wolf

doi:10.1103/PhysRevB.42.8682

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Apparent critical currents and rf steps in a second-order proximity-induced Josephson effect

Siyuan Han, L. F. Cohen, E. L. Wolf

DOI 10.1103/PhysRevB.42.8682 · Physical Review B

T1

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Abstract

Numerical I(V) results for superconductor–insulator–normal-metal (S-I-N) tunnel junctions suggest that a unified treatment of the weak excess currents (pair-field susceptibility) and proximity-induced Josephson-effect (PJE) phenomena [apparent critical currents, rf steps, and Fraunhofer-like Ic(B)] is provided by the Geshkenbein-Sokol time-dependent Ginzburg-Landau theory of second-order Josephson effects in S-I-N tunnel junctions. The numerical results and other considerations speak against a recent suggestion that a phase-slip center in the superconducting tip may play a role in PJE point-contact experiments. These considerations confirm the utility of proximity Josephson-effect experiments to probe unconventional superconductivity in materials such as UBE13, as first pointed out by Han et al.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown