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

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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)8682-8685
Number of pages4
JournalPhysical Review B
Volume42
Issue number13
DOIs
StatePublished - 1990

ASJC Scopus subject areas

  • Condensed Matter Physics

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