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V. E. SHATERNIK, S. Yu. LARKIN, I. V. BOYLO, and A. P. SHAPOVALOV
«Josephson Critical Current in Nb/AlAlOxNb Junctions with Nanoscale Al Interlayer: Control of Energy Dissipation»
951–961 (2009)

PACS numbers: 73.40.Rw, 74.25.Sv, 74.45.+c, 74.50.+r, 74.78.Na, 74.81.Fa, 85.25.Cp

This work is stimulated by a search for a suitable technology for fabrication of practically applicable Josephson junctions that could be tuned from under- to overdamped type by an external parameter and capable to work at temperatures accessible by closed-cycle refrigerators. Experimental and theoretical studies of the Josephson effect in S/N–I–S junctions made of two superconducting Nb electrodes (S), a nanometre-scale Al interlayer (N), and the AlOx tunnel barrier (I) are carried out. As shown, the minigap developed in the electron spectrum of a normal-metal Al layer in contact with a superconductor determines the temperature dependence of the critical current in the S/N–I–S devices. This observation suggests the possibility of controlling the energy dissipation of a Josephson junction by temperature.